Since the updates of 21/07 i get disconnected on client side in reason of a render thread.

On Version 1.20.1-5.1.0 it's working.

Attached is the latest debuglog

debug.log

thanks for bug reporting!
try this build and try again
https://modrinth.com/mod/bagus-lib/version/1.20.1-5.2.1

or... If cannot solved
try open the bloomingnature's github's issues. It seem HierarchicalModel's root method is null

it's working, thx