Fire From Blown Up Respawn Anchor Still Spreads When Firetick is off

This is also for beds, so I don't think this is a bug.
fire tick is only about fire spreading and aging, not creation of fire, except for lightning, as players have no control over lightning, and it'd create fire all over the world.

Are you sure the fire is actually spreading, or is it all staying the same or disappearing after a while?

Yes, the fire was spreading very slowly though
this also happened when i tested it on realms