Capsid gradle plugin runs endlessly when decompiling Class files

[mlem]

I've tried to follow this guide https://github.com/Konijima/PZ-Libraries to decompile PZ 41.76.
I've thought, that the decompiling just takes longer, but in the log I've seen that an error occured and stopped all other decomiling steps.

INFO:  ... done
INFO:  Decompiling class zombie/network/GameClient
ERROR:       Unable to simplify switch on enum: 1 not found, available: {}
INFO:  ... done
INFO:  Decompiling class zombie/network/FakeClientManager
Unable to simplify switch on enum: 1 not found, available: {}

Actually I've found Unable to simplify switch on enum: 1 not found, available: {} this line 9 times in the logs.