System flow skipped when previous run not ended

I have a system flow A that runs every second. Most of the time nothing happens but sometimes someting does happen. Am i right to conclude that the next scheduled run of system flow A is skipped if the previous run of system flow A has not yet ended?

I want to avoid that multiple of the same system flow run at the same time. I've done some tests and the next run seems to be skipped when the previous run has not ended yet, but i cannot find a definitive answer in the documentation.

Thank you