Don't know why it happened when interacting with a botania block but the crash report says is on ichunutil
Mod version:
iChunUtil-1.12.2-7.1.3

Mods I have that use this lib:
MobAmputation-1.12.2-7.0.0
MobDismemberment-1.12.2-7.0.0

Crash report:
https://pastebin.com/sDzMViZn

Also don't really know but maybe is sort of related with the Realistic Item Drops mod, haven't tested but is the other mod that I have that has to execute code when breaking a block since it changes the items dropped in world.

Alright so I did some more testing and it seems to me the problem is the realistic item drops mod since it randomly crashed when breaking blocks even after I removed ichunutil. The botania flower crash only happens when this mod is installed alongside though. Anyway the problem is most likely on realistic item drops so I'm gonna close this and open an issue there.
Ok so after actually reading the second crash report It seems like the problem is with the SwingThroughGrass Mod so I'll go with them