Can't join in server after installing/deleting mod(s)

[Ibirtem]

So, after installing new mods in existing world and start LAN (Using Hamachi hah), friend can't join in my server: "Failed to synchronize registry data from server, closing connection".
Deleting installed mod(s) not helpful, now this inscription will exist forever. Yes, we all have identical versions of mods and other stuff. It can happen even we update one mod. Only helpful: delet this world and create new, but it's not the best choice. 
Forge latest ( 1.16.4 - 35.1.13 ). 
Here my latest: https://gist.github.com/Ibirtem/04086dcb560758a729c8f73d0b837d94
Debug: https://gist.github.com/Ibirtem/89c5a828a7cf7eb64e8387d075216453
Also i can give you logs of my friends.

[Ibirtem]

Here debug from client who can't join: https://gist.github.com/Ibirtem/3339194ef6025f80ebb1d457d3d65a09
and I correctly understood that the server debug is also needed? Bcz it's Lan server and i dont know how to get it

[Ibirtem]

So that's the problem. How i say, after installing new mods, friend can't join  to me, bcz "Failed to synchronize registry data from server, closing connection". As I recall, the error was in non-existing objects from the mod SnowRealMagic, but huh, we dont deleting this mod. Only install new. YeS he has that mod to. And after we removed this new mod with the hope that the mod just breaks the server. I dont have this mods, but Forge not deleting old... Files i guess?
There lines from my debug after entering in world:

[23дек2020 07:29:06.987] [Render thread/ERROR] [net.minecraftforge.registries.GameData/REGISTRIES]: Unidentified mapping from registry minecraft:block
	betterendforge:aeternium_block: 6517
	betterendforge:aurora_crystal: 6520
	betterendforge:blue_vine: 6534
	betterendforge:blue_vine_fur: 6536
	betterendforge:blue_vine_lantern: 6535
	betterendforge:blue_vine_seed: 6533
	betterendforge:bubble_coral: 6544
	betterendforge:cave_bush: 6537
	betterendforge:cave_grass: 6530
	betterendforge:cave_moss: 6508
	betterendforge:cave_moss_path: 6515
	betterendforge:chorus_grass: 6529
	betterendforge:chorus_nylium: 6507
	betterendforge:chorus_nylium_path: 6514
	betterendforge:creeping_moss: 6528
	betterendforge:crystal_grass: 6531
	betterendforge:crystal_moss: 6504
	betterendforge:crystal_moss_path: 6511
	betterendforge:cyan_moss: 6550
	betterendforge:dense_vine: 6551
	betterendforge:dragon_tree_bark: 6622
	betterendforge:dragon_tree_button: 6628
	betterendforge:dragon_tree_door: 6631
	betterendforge:dragon_tree_fence: 6626
	betterendforge:dragon_tree_gate: 6627
	betterendforge:dragon_tree_leaves: 6562
	betterendforge:dragon_tree_log: 6621
	betterendforge:dragon_tree_planks: 6623
	betterendforge:dragon_tree_pressure_plate: 6629
	betterendforge:dragon_tree_sapling: 6561
	betterendforge:dragon_tree_slab: 6625
	betterendforge:dragon_tree_stairs: 6624
	betterendforge:dragon_tree_stripped_bark: 6620
	betterendforge:dragon_tree_stripped_log: 6619
	betterendforge:dragon_tree_trapdoor: 6630
	betterendforge:end_lily: 6539
	betterendforge:end_lily_seed: 6538
	betterendforge:end_lotus_bark: 6596
	betterendforge:end_lotus_button: 6602
	betterendforge:end_lotus_door: 6605
	betterendforge:end_lotus_fence: 6600
	betterendforge:end_lotus_flower: 6543
	betterendforge:end_lotus_gate: 6601
	betterendforge:end_lotus_leaf: 6542
	betterendforge:end_lotus_log: 6595
	betterendforge:end_lotus_planks: 6597
	betterendforge:end_lotus_pressure_plate: 6603
	betterendforge:end_lotus_seed: 6540
	betterendforge:end_lotus_slab: 6599
	betterendforge:end_lotus_stairs: 6598
	betterendforge:end_lotus_stem: 6541
	betterendforge:end_lotus_stripped_bark: 6594
	betterendforge:end_lotus_stripped_log: 6593
	betterendforge:end_lotus_trapdoor: 6604
	betterendforge:end_moss: 6506
	betterendforge:end_moss_path: 6513
	betterendforge:end_mycelium: 6505
	betterendforge:end_mycelium_path: 6512
	betterendforge:end_portal_block: 6566
	betterendforge:end_stone_smelter: 6565
	betterendforge:ender_block: 6519
	betterendforge:ender_ore: 6521
	betterendforge:endstone_dust: 6510
	betterendforge:eternal_pedestal: 6563
	betterendforge:flavolite: 6632
	betterendforge:flavolite_bricks: 6641
	betterendforge:flavolite_bricks_slab: 6643
	betterendforge:flavolite_bricks_stairs: 6642
	betterendforge:flavolite_bricks_wall: 6644
	betterendforge:flavolite_button: 6639
	betterendforge:flavolite_pillar: 6635
	betterendforge:flavolite_polished: 6633
	betterendforge:flavolite_pressure_plate: 6640
	betterendforge:flavolite_runed: 6522
	betterendforge:flavolite_runed_eternal: 6523
	betterendforge:flavolite_slab: 6637
	betterendforge:flavolite_stairs: 6636
	betterendforge:flavolite_tiles: 6634
	betterendforge:flavolite_wall: 6638
	betterendforge:infusion_pedestal: 6564
	betterendforge:lacugrove_bark: 6583
	betterendforge:lacugrove_button: 6589
	betterendforge:lacugrove_door: 6592
	betterendforge:lacugrove_fence: 6587
	betterendforge:lacugrove_gate: 6588
	betterendforge:lacugrove_leaves: 6558
	betterendforge:lacugrove_log: 6582
	betterendforge:lacugrove_planks: 6584
	betterendforge:lacugrove_pressure_plate: 6590
	betterendforge:lacugrove_sapling: 6557
	betterendforge:lacugrove_slab: 6586
	betterendforge:lacugrove_stairs: 6585
	betterendforge:lacugrove_stripped_bark: 6581
	betterendforge:lacugrove_stripped_log: 6580
	betterendforge:lacugrove_trapdoor: 6591
	betterendforge:mossy_glowshroom_bark: 6570
	betterendforge:mossy_glowshroom_button: 6576
	betterendforge:mossy_glowshroom_cap: 6554
	betterendforge:mossy_glowshroom_door: 6579
	betterendforge:mossy_glowshroom_fence: 6574
	betterendforge:mossy_glowshroom_fur: 6556
	betterendforge:mossy_glowshroom_gate: 6575
	betterendforge:mossy_glowshroom_hymenophore: 6555
	betterendforge:mossy_glowshroom_log: 6569
	betterendforge:mossy_glowshroom_planks: 6571
	betterendforge:mossy_glowshroom_pressure_plate: 6577
	betterendforge:mossy_glowshroom_sapling: 6553
	betterendforge:mossy_glowshroom_slab: 6573
	betterendforge:mossy_glowshroom_stairs: 6572
	betterendforge:mossy_glowshroom_stripped_bark: 6568
	betterendforge:mossy_glowshroom_stripped_log: 6567
	betterendforge:mossy_glowshroom_trapdoor: 6578
	betterendforge:murkweed: 6545
	betterendforge:needlegrass: 6546
	betterendforge:purple_polypore: 6548
	betterendforge:purpur_pedestal: 6525
	betterendforge:pythadendron_bark: 6609
	betterendforge:pythadendron_button: 6615
	betterendforge:pythadendron_door: 6618
	betterendforge:pythadendron_fence: 6613
	betterendforge:pythadendron_gate: 6614
	betterendforge:pythadendron_leaves: 6560
	betterendforge:pythadendron_log: 6608
	betterendforge:pythadendron_planks: 6610
	betterendforge:pythadendron_pressure_plate: 6616
	betterendforge:pythadendron_sapling: 6559
	betterendforge:pythadendron_slab: 6612
	betterendforge:pythadendron_stairs: 6611
	betterendforge:pythadendron_stripped_bark: 6607
	betterendforge:pythadendron_stripped_log: 6606
	betterendforge:pythadendron_trapdoor: 6617
	betterendforge:quartz_pedestal: 6524
	betterendforge:shadow_berry: 6547
	betterendforge:shadow_grass: 6509
	betterendforge:shadow_grass_path: 6516
	betterendforge:shadow_plant: 6532
	betterendforge:tail_moss: 6549
	betterendforge:terminite_block: 6518
	betterendforge:twisted_vine: 6552
	betterendforge:umbrella_moss: 6526
	betterendforge:umbrella_moss_tall: 6527
	betterendforge:violecite: 6645
	betterendforge:violecite_bricks: 6654
	betterendforge:violecite_bricks_slab: 6656
	betterendforge:violecite_bricks_stairs: 6655
	betterendforge:violecite_bricks_wall: 6657
	betterendforge:violecite_button: 6652
	betterendforge:violecite_pillar: 6648
	betterendforge:violecite_polished: 6646
	betterendforge:violecite_pressure_plate: 6653
	betterendforge:violecite_slab: 6650
	betterendforge:violecite_stairs: 6649
	betterendforge:violecite_tiles: 6647
	betterendforge:violecite_wall: 6651

[23дек2020 07:29:06.990] [Render thread/WARN] [net.minecraftforge.registries.GameData/REGISTRIES]: Forge Mod Loader detected missing registry entries.

There are 154 missing entries in this save.
If you continue the missing entries will get removed.
A world backup will be automatically created in your saves directory.

 

If you continue the missing entries will get removed.

So? Not removed.

Edited December 23, 2020 by Ibirtem

[Ibirtem]

It's singleplayer, so i don't see this message. Both of us delete mod, so how friend debug log says that these blocks are still there?

[Ibirtem]

I posted...
My Debug: https://gist.github.com/Ibirtem/89c5a828a7cf7eb64e8387d075216453
debug from client who can't join: https://gist.github.com/Ibirtem/3339194ef6025f80ebb1d457d3d65a09

[Ibirtem]

A friend lives in a different time zone

[Ibirtem]

Only this. Everytime

 

[Ibirtem]

Yes. there new log https://gist.github.com/Ibirtem/2080201fdc52eb790eca98f23543bff2

Edited December 23, 2020 by Ibirtem

[Ibirtem]

Seems to have found the problem. It's happens only with... OptiFine.