The client crashes by interacting in the GUI of a specific blueprint
Base GUI:

by activating the "Roller" like this and saving:

makes it crash by viewing the blueprint GUI

Forge 47.3.7
CreativeCore_FORGE_v2.12.17_mc1.20.1
LittleTiles_BETA_v1.6.0-pre131_mc1.20.1
pre change blueprint.txt
crashing blueprint.txt
crash-2024-10-16_22.25.15-client.txt