Minecraft version 1.17
Using Minecolonies 1.0.27-Alpha (and confirmed with minecolonies 1.0.56)
Using Block-UI 0.0.26-Alpha
Using Forge 1.0.85

In forge 1.0.85, tooltips changed. From this forge version onwards, minecraft crashes when the recipe book is opened and you have a build tool and wooden planks in your inventory, and just minecolonies and its dependencies are loaded.

Crash log: https://gist.github.com/MotionlessTrain/9d1bf7be909dd8f2ab095b869c8f5223

By removing mods, it turned out this didn't happen with just the dependency mods loaded. When minecolonies was added as well, it started to crash.

I asked Ray on stream where I should post the crash log, and he pointed me to here.

Not blockui problem, usually problem of item owner (item mod)

I'll post it on the minecolonies issue tracker then

No, not related to MineColonies.

You are completely right. I just reproduced it with just forge 37.0.85 (and no mods installed)