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You should take a careful read of the 1.12 -> 1.13/1.14 update primer linked at the top of this forum. In particular, this comment will be helpful to you: https://gist.github.com/williewillus/353c872bcf1a6ace9921189f6100d09a#gistcomment-2870154 Regarding your original problem (TE data not saving), are you marking the tile entity dirty when the inventory changes? If not, your changes won't get saved. Best bet is to override the onSlotChanged() method of your ItemStackHandler object to call te.markDirty().

Give the player mining fatigue? Override ItemArmor#onWornTick (can't remember the spelling) and checks the ItemStack the player is holding. If the ItemStack is not empty, drop it.

I think what @Rainney Uchiha is trying to say, is that they want to play mods written against two different versions of Java Edition in the same installation. If that is what you want to do, then I have to disappoint you. Due to technical reasons a specific version of a mod is only ever written against a specific version of a game. E.g. you cannot install a 1.8 mod in a 1.12 game. However, the creator of the older mod might have updated theirs for the latest version of the game, or the newer mod might have already been available for an earlier version of the game. You should search through all versions of the mods that you want to play together to figure out if they overlap.

Looks like a tombstone mod is causing this.

A sample replacement EAQ