ID 542494 - [BACKPORT] The selected panel can intermittently move to the first panel of a sequence

Problem summary
The selected panel can intermittently move to the first panel of a sequence
 
Customer reported version
flix_6.5.0
 
Customer reported platform
mac.12
 
Steps to reproduce
 
1) Import 100+ panels in a sequence

2) Move a few panels around in the middle of the sequence

3) Use the arrow keys to move around the sequence
 
You might need to repeat steps 2 and 3 a few times before the problem appears.
The problem happens using the arrow keys and also using a mouse or a Cintiq pen.
 
Expected behaviour
The selected panel should change to the panel next to the currently selected panel.
 
Actual behaviour
The selected panel jumps to the first panel of the sequence and it's not visible in the current view. Sometimes the selected panel jumps back and forth to another location. Once the problem is triggered, it happens much quicker. Reloading Flix fixes the problem for a little while
 
Workaround
Unknown. 
 
Reproduced by support
6.5 CentOS server and Windows client
6.5 OSX M1 Monterey server and client