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You also need to override TileEntity#getMaxRenderDIstanceSquared for reference the Beacon returns a value of 65536.0D

The only mod I see referenced in this log is speedy hoppers, if you remove that mod, does it still crash? also, where did you download mods from? I would only download them from Curseforge, if you downloaded them from shady websites like 9minecraft, delete them immediately and redownload them from curseforge. See https://stopmodreposts.org/ for more information on why this is bad. If you got your mods from a legit source, and it still crashes after removing speedy hoppers, post the new crash.

It would be better if you posted your code as a git repo rather than file attachments. In any case, you don't need your TinPickaxe and CopperPickaxe classes. They override none of the PickaxeItem class methods and pass their constructor arguments to super without modification. There is nothing "coppery" about your CopperPickaxe class.

The fluid system is being worked on. Right now we are waiting for king lemming to push his changes. Once those are in we can deal with adding specific things people want. Until then, feel free to comment on the WIP PR for fluids. Instead of here.

Can't tell if you are messing with them or not lol. You need to override their registry value with a new value that overrides getRenderLayer and returns the appropriate value.