[MC-278423] The oxygen bar is refilled when you consume some oxygen and get water breathing effect

This does not occur in 1.21.3 and 24w46a.

Steps to reproduce:

Go to the underwater in survival mode and wait until empty state of air bubble icon appears
Run /effect give @p water_breathing 10

Expected result: The oxygen bar stops decreasing and retains its state.

Observed result: The oxygen is regenerated immediately.

Attachments

This is likely consistent with Bedrock, but the oxygen regeneration speed is rather fast.

Then there would be another parity issue, if this is an intended feature.