The bug
You can clip into half slabs underwater and while in them can breathe.
How to reproduce
Place a slab on the top half of a block underwater.
Break the block beneath so you have a space of 1.5 blocks.
Swim under the slab and stand up.
→ ❌ You are now clipped into the slab.
Related issues
Attachments
Comments


This relates to [MC-125240]

This relates to MC-96922, because the swimming mechanic is similar to the elytra mechanic.

Unable to reproduce in 20w29a

i guess it was patched @Anthony Cicinelli