was meant to resolve issues created by the 10.15.4 update in late March
The "fix some bugs, add some new ones" trend has certainly gotten more common within the past few years. I still remember when the official advice was not to install updates unless you were experiencing the issues it was to fix, but that wasn't really applicable to security fixes, and now official advice seems to be "always install" regardless of security or indeed usefulness.
was meant to resolve issues created by the 10.15.4 update in late March
The "fix some bugs, add some new ones" trend has certainly gotten more common within the past few years. I still remember when the official advice was not to install updates unless you were experiencing the issues it was to fix, but that wasn't really applicable to security fixes, and now official advice seems to be "always install" regardless of security or indeed usefulness.