Steps to Reproduce the Bug

Have a screen that defines its extras areas a screen init method
Such as https://github.com/Alpha-s-Stuff/TinkersConstruct/blob/8cdebdb5cbf7b16381099f2d4247ef009c1d35b2/src/main/java/slimeknights/tconstruct/tables/client/inventory/BaseTabbedScreen.java#L48

Expected Behavior

For my screens areas to be initialized fine

Actual Behavior

Game crashes saying my tabsScreen variable is null which is initialized after init, which rei calls before init

Mod Pack URL (Optional)

No response

Mod Pack Version (Optional)

No response

Extra Notes (Optional)

No response

latest.log

https://gist.github.com/AlphaMode/decb5741e35f02d06cf07b5059dd9356

Thanks for the report!
This seems to be an issue in Tinker's Construct:
https://github.com/SlimeKnights/TinkersConstruct/blob/c52d82ce60872f70263ac7b30f378e9bcb659ce2/src/main/java/slimeknights/tconstruct/tables/client/inventory/BaseTabbedScreen.java#L96-L101C4

You can check if tabsScreen is null, and if so just return an empty list.

I can move the JEI code to run after the GUI is init in Fabric so that it works the same as in Forge as well.