False alarm. Not fixed. I am very confused about the 14.7.5 and 18.4 updates I applied today as I had already done them on March 25th. But after updating those as requested by macOS, the Safari tab issue fixed itself for a bit. 3 reboots later and it is back to where it was before [the system update did break Hazel very badly for me, causing a full work stoppage so now I am trying to figure out how to roll back the OS to whatever build of 14.7.5 I installed on march 25th].