Sorry to be dragging this out, but still confused:
This is my takeaway, and what I suggested above. Please tell me if this what you mean:
First, install the Supplemental, which will provide the Safari 14.0. Then run the 2020-007 package. Re-patch. Then get the 14.0.1 and 14.0.2 from SU. Then, over that run the Safari 14.0.2 standalone you linked, which will resolve the issues I've been experiencing?
>>P.S. I am running Mojave on APFS, not sure if your HFS+ file systen is the issue. It should not be as plenty of people don't have any issues with it.
When I first installed Mojave from the patcher, and after the first several SecUpdates, I did not experience any of these issues on the HFS+ HDD internal drive. These problems started surfacing only with some of the relatively recent updates. Unable to pinpoint or remember right now just which updates. So seems like the HFS+/HDD is not the direct cause.
Yes, this should work, just don't forget to restart the system at the very end of it all. The reason I provided you with Safari link is that you can keep it and solve any issues in case you do get the order wrong.
Just hold on to this Safari 14.0.2 download and you will foolproof your entire approach, as the only reason you had to go back to 18G103 is because you did not have Safari 14.0.2 saved.