At around August of Last year, since that update with the id conversion fix dropped, my server log has been exploding with:

[23:10:58] [Server thread/WARN]: Skipping Entity with id minecraft:
[23:10:58] [Server thread/WARN]: Skipping Entity with id minecraft:
[23:10:58] [Server thread/WARN]: Skipping Entity with id minecraft:
[23:10:58] [Server thread/WARN]: Skipping Entity with id minecraft:
[23:10:58] [Server thread/WARN]: Skipping Entity with id minecraft:
[23:10:58] [Server thread/WARN]: Skipping Entity with id minecraft:
[23:10:58] [Server thread/WARN]: Skipping Entity with id minecraft:

I recently ported chunks that did that to a SP world with the same level.dat, and the issue persisted. Removing other mods to change ids did not fix, but removing future mc then entering those chunks does fix the issue, even if you re-add future mc. This means that with the strange id conversion logic of future mc, starting around Future MC 1.12.2 0.2.3.2 to the present future-mc-1.12.2-0.2.6.1.jar, futuremc has been messing up chunks in a way that assassinates servere logs/console.

A fix for the issue would be a life-saver for server owners.