im using farbric 1.20.4.
after upgrading to 3.0.0 from 2.2.1, blocks vertical cobblestone blocks take a long time to break and when I try to craft an oak trapdoor I get oak walls.

Maybe you have to enable the datapack manually, which is actually enabled by default.
/datapack enable "extshape:recipe_tweak"

Harvesting cobblestone seems the bug and I will fix it. About crafting oak trapdoors, I remember changing it in a separate built-in data pack which is enabled by default. You may use /datapack command to check it.

Harvesting cobblestone seems the bug and I will fix it. About crafting oak trapdoors, I remember changing it in a separate built-in data pack which is enabled by default. You may use /datapack command to check it.

Testing in single-player, I can craft oak trapdoors in 3.0.0. But when I had the issue, I was playing on a server.