While joining the world I got this error:

auqAdenotS lost connection: Internal Exception: io.netty.handler.codec.EncoderException: java.lang.RuntimeException: Failed to access pattern field in ShapedRecipe

When I removed mod Joy of Painting, error vanished.

Hey, i get this too, and its definetly this mod causing it, dont know what its incompatible with, however...

it's not a mod incompatibility, it's a weird mapper hack that happens in RecipeTaglessShaped.java. fixing it is ripping out the body of the function and pretty much just replacing it with return this.pattern; and an access widener to make it accessible. i'm not sure WHY the hack was done; the 1.20.6 commit actually adds an accesswidener but for a completely different thing and leaves that part untouched...

either way, here's the patch and here's a build

i don't feel comfortable rehosting a fixed version of this mod to curseforge or modrinth despite being GPL (i dont want to be scummy with rewards) so it'll be here for now