Thank you for the update to 1.20. Seems the feature to scoop up Quicksand in buckets is causing a crash. Attempting to do so causes a crash with the following error in the log:

[04:51:30] [Render thread/ERROR]: Unreported exception thrown!
java.lang.AbstractMethodError: Receiver class com.shnupbups.quicksand.block.QuicksandBlock does not define or inherit an implementation of the resolved method 'abstract net.minecraft.class_1799 method_9700(net.minecraft.class_1936, net.minecraft.class_2338, net.minecraft.class_2680)' of interface net.minecraft.class_2263.

Might not be inheriting the ability to be scooped up like a fluid like Powder Snow, it seems.

Will look into tomorrow

Released a 1.20.1 backport so you can use that :)

ah, you're using 1.20.1. This version only works on 1.20.2.