I've just played Minecraft for the first time in a month and it has major Frame rate issues in the inventory/ crafting menus. Additionally, the "Max Frame rate" option seems to work sometimes, I've set mine at 240fps but it keeps jumping between 120fps and 240fps.

I've seen this on Xbox, pc and switch (unsure about PS4/5).

It's noticed it's using DX12 instead of OGL so maybe just transition issues changing the api?