Private window with Tor disconnected

on Mac OS High Sierra since few days “Private window with Tor” is permanently “Disconnected”. But Native Tor Browser works OK on this setup. “Toggle” does not resolve this issue; turning bridges on also does not work for me. On the same MacBook, but Mac OS Catalina installed - Tor is “Connected” without any problem.
Any solution please?

If there is no solution to even such a trivial problem, what to think about this browser…
Is this browser really safe?