Drowned spawn at any light level

Drowned are spawning in my survival world on an ocean floor that is well-lit with sea pickles, jack-o-lanterns, and glowstone. I am trying to make a witch farm from a witch hut that is near an ocean. I have lit the ocean floor, but drowned continue to spawn. In the attached video you can clearly see drowned spawn within a few blocks of multiple light sources. The block they spawn on is 7 blocks from a Jack-o-lantern, 3 blocks from one full sea pickle colony, and 6 blocks from another full sea pickle colony.

This seems to be the same issue as MCCE-7893 but I did not see it reported for Bedrock. It relates to MCPE-34032.