Bug report Acrobat Reader on Android 10, on Samsung S10.

If I leave the app, without closing it, for doing something else, and then I try after a few time to come back to the app by pressing the button that shows all the currently running apps, there is this error showing in french:
"Application indisponible"

Its means App unavailable.

So i have to close the app, open it again, and look for the file I was reading from the start.

It only does it with the Acrobat app.
Obviously the app is up to date, the samsung rom is up to date, and I chose the option on my phone to never stop running this app in case it was some "battery saving" issue.

Thanks