Arduino create agent disappearing when uploading

Since a week I am enrolled in the Arduino Cloud, now only using the web editor for the time being.
I use Chromium on a Linux Mint 20.3.
I use to first start Arduino_Create_Agent by doubleclicking. and the Arduino icon is on the taskbar.
I can connect to the board, verify the sketch and in some cases upload. In most cases however the Arduino icon is disappearing from the taskbar once I start the upload and the web editor, of course, starts complaining that I need to install the agent.
So, close Chromium, then restart the agent, restart Chromium etc. I get connected to the board again and 9 out of 10 when I start the upload I get the same issue.
Btw: I installed the agent from within Chromium hence it should be the right version/type and not the firefox version.

It's cumbersome to such extend that I had to start using the Arduino IDE 1.8/2 again. These are great but I regret that I can, de facto, not use the cloud version.

Can anyone point me to a solution?

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