This doesn't happen with 0.4.6

Because of how Random Patches applies its patch to the Minecraft Client, basically anything else that interacts with it will generate a crash - which GroovyScript does in its GuiScreenMixin to improve copying functionality, introduced in this commit f5c86a5.

This can be prevented by changing the Random Patches config setting to B:patchMinecraftClass=false.

Note that if you look in the reported diff, between v0.4.6 and v0.5.2, you wont find this commit, as it was introduced prior to v0.4.6 - specifically v0.4.0. This is reflected in actual testing, as it is not experienced in v0.3.1 and experienced in v0.4.0

Additionally, while Universal Tweaks doesn't fully replicate the features of Random Patches, it contains most of them, so i would suggest trying to switch to that instead.

crash log pls

also happens with 0.6.1
latest.log