Lunux appimage is slow to see new serial devices, and remove disconnected devices

The device droplist, (Where the ttyUSB1 is) is not properly updated as a device is removed/added, causing “cannot communicate” or similar text.

Distro: Ubuntu 19.10

That drop list is only updated when expanded, regardless of platform.

Please see attached screenshot.
I did disconnect ttyUSB1 , opening/closing the droplist, or licking “choose” does not remove it from the list. This causes some confusion now-and-then.

All I do is query the system itself for the list of current devices. I suspect Linux (or the framework we use) is not getting the disconnect immediately.

in this case, it does not seem to get the disconnect ever, I had it like this since yesterday.