Lava doesn't deal damage

[Lego lad]

on my server, lava does not deal damage to players, which is odd because it used to.
I've tried resetting the environment settings from simple to advanced, I've tried it in a mini game, and it still wont work.
Help?

[Ad Bot]

[Blocki]

My dedicated server has the same problem

[gr8dayseth]

Same for me aswell.

[Butler]

Using events is works.

[K3k0m@n]

disable oxygen mod is it's enabled.