The bug

MC-70127 was marked as fixed for 1.20.2 pre-release 1. However, fire is still seemingly affected by the issue.

How to reproduce

1. Open your F3 screen
2. Light a fire on a non-flammable block
3. Wait fifteen seconds
4. Right click the fire
5. If "age" does not change from 0 to 1 or higher, repeat steps 2-3

Expected results

The age state of the fire would increase on its own, which would be reported by the debug screen since you're looking at it and right clicking on the fire wouldn't do anything.

Actual results

Right clicking the firecauses the displayed "age" value to instantly increase from 0 to 1, implying that the block's state change on the server was not communicated to the client until a player interaction with this block forced it to update client-side.