Steps to reproduce 

1. Place a campfire, and next to it a slab or mud.
2. Spawn a mob on the slab/mud.
3. Nudge the mob so it hangs over the campfire but stays supported by the mud/slab.

Expected result

The mob catches fire and takes fire damage.

Observed result

The mob does not catch fire or take any damage.

In version 1.19.60, players standing between a campfire and incomplete blocks were harmed by a campfire. This is the same sa the JAVA version. However，In Preview1.19.70.23, players standing between campfires and incomplete blocks will not be harmed。

I may not be able to express it exactly, you can understand it by comparing two videos