If bug:

• Forge Version: 14.23.5.2855 for minecraft 1.12.2
• Mod Version: 0.5.5 (crashes) and 0.3.3 (freezes)
• Can you reproduce this issue with relevant mods only? yes.

Crash report:
https://pastebin.com/8n8QnbHz
There is an incompatibility with Dynamic Trees. It can be seen in the crash report, mods responsible are SnowRealMagic and DynamicTrees.

I was previously using the version 0.3.3 and it started freezing up at any second when snowy biomes were encountered. Only thing I changed was I set the config setting PlaceSnowInBlock=false and the freezing started happening. Then I tried to update to version 0.5.5 and the game outright crashes when trying to load up a world. The crash report has the exact same error that is printed in log when the game freezes, it's this one:
java.lang.IllegalArgumentException: Cannot get property PropertyBool{name=tile, clazz=class java.lang.Boolean, values=[true, false]} as it does not exist in BlockStateContainer{block=minecraft:snow_layer, properties=[layers]}
After that it forcefully shuts down the server and the game freezes.

I changed back to version 0.3.3 and turned the setting PlaceSnowInBlock=true and the freezing stopped. It does not stop the version 0.5.5 crashing. I even tried removing the mod, deleting the config file, loading the world, re-inserting the mod and loading the world again but that didn't work either. I'll be using version 0.3.3 with setting PlaceSnowInBlock=true for now. I hope this will be useful and can be fixed.