I also just installed on a pi 4 and had the same issue -- devices worked but 
would not persist across reboots, and then successive re-adds were... strange, 
unreliable, etc.  Lots of "it appears to work but doesn't."  Tried the PPA 
packages and it worked at first, but was seriously inconsistent at adding and 
removing devices.  I downgraded the PPA packages back to originals and still 
couldn't reliably add devices.  I re-upgraded to PPA packages and the bluetooth 
was essentially working less than ever.  Since it felt like a software issue, 
like configurations and "sessions" were being munged, I killed BT, searched 
around and wiped out /var/lib/bluetooth/* (which appeared to have multiple base 
addresses???) and then I was able to clean out gnome's ui and re-add and things 
now persist across reboots.  
  
To me, this seems like the PPA fixes the issue, but the original packages 
created a state where there were multiple stale / conflicting states in 
/var/lib/bluetooth that you must disabled bt, clean, then re-enable / reboot 
and things work.  It almost feels like the original packages had the BT adapter 
changing addresses each boot or similar.

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https://bugs.launchpad.net/bugs/1901272

Title:
  Can't connect Bluetooth devices after reboot - Ubuntu 20.10 on
  Raspberry Pi 4

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