There have been a number of times in my current world that I've found lava under water, or a column of lava going down into water, and it just stays as a column of lava, though there was obsidian below it, but a definite block of flowing lava under the water on top of the obsidian.

The picture with lava under the water was on 2/7/22.

The pictures of the lava column into water were on 4/8/22.

I'm on PS4, and always the latest release.

I have wondered if this is related to MCPE-156281, being that it's water glitch related, but I think MCPE-156281 is a visual glitch, whereas this seems to be actual lava inside water.

I didn't actually test whether the lava could burn, as it really didn't occur to me to step into lava!