Im pretty sure the particles of breaking a block in creative should show underwater but they dont.
what happen is there was no block breaking particles when your're above the water but when your're under the water u can see the particles. and the reverse will happen if your're under water and break a block on land there you wont see particles.
to trigger it place 1 block under water and break it and you'll see there are no particles compared to breaking it on land
Thank you for your report!
We're actually already tracking this issue in MC-161917, so I've resolved and linked this ticket as a duplicate.
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