Ravagers caught in stationary minecarts (nametagged) suddenly start taking damage and then die. There are no blocks around them that could cause suffocation.

The attached image shows the two empty minecarts that each held a ravager that suddently started taking damage and died.

I have the suspicion that the damage-taking occurs when you leave the area and then come back but difficult to say exactly.

Also this seems to be a new issue in 1.20.5-pre-1, because the ravagers had been there for a while when playing in earlier versions without taking any damage.