With a combination of OptiFabric, FerriteCore and Minecraft Transit Mod, the game will have a chance of crashing when Minecraft Transit Mod's Automatic Platform Gates opens.

This seems like a separate issue and is unrelated to FerriteCore, but I can no longer reproduce the crash after removing FerriteCore.
Crash report

FerriteCore Config:
replaceNeighborLookup = true
replacePropertyMap = true
cacheMultipartPredicates = true
modelResourceLocations = true
multipartDeduplication = true
blockstateCacheDeduplication = true
bakedQuadDeduplication = true
compactFastMap = false
populateNeighborTable = true

Here's what some other modder has to say (Which I don't quite understand):

Is there any chance this could be resolved? Or are we stuck with this crash

I have at least a general idea on what's causing this (a race condition on the cache used for multipart models), but I need to look into it in more detail. If my guess is right the vanilla code for multipart models is even more stupid than I thought. For now disabling multipartDeduplication in the config might "fix" it.