I installed MacOS 10.15.5 Beta 1 this afternoon so that will have changed the test parameters and make any conclusions from my experience suspect. 😞
By the way, which version of Safari are you running in 10.15.5?
My issue is with Version 13.1 (15609.1.20.111.8).
The new Great Equalizer is the SEND button.
In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire