Your original breaker was extremely old, maybe around 40 years. Your replacement breaker is not much younger.
When you purchased your breaker did it come from a certified refurbishing company, or was it bought from someone that had one laying around?
In either case, when you had it installed was its tripping curve tested.
Generally a breaker, without load, should not trip on a power loss.
Yes it is possible for breakers to have undervoltage tripping, but you would have some control wiring if yours has this module.