I attached a reproducer of the problem. If I am executing the rules without serialization everything is working correctly.

If I am executing it with serialization the rules are firing to often. I expect the rule to fire only once. It should fire once at 03:06:00 but it fires 3 times, once at 3:04:00 and 2 times at 3:06:00.

It have to be a problem with serialization of the temporal operators like after,before, etc.