Hello,
Core Update 128 is running for about two days here by now.
So far, I did not observe any usual or buggy behaviour. RAM consumption seems to be more volatile after the upgrade, possible due to updated Tor version.
Accessing the WebUI via TLS 1.3 works fine and by default with Firefox 60.5.1esr.
I can confirm bug #11973 is fixed after upgrading and rebooting the machine.
Thanks, and best regards, Peter Müller