Some flatpak applications need more than 90 seconds to start and hog a cpu core when "isolate workspaces" is enabled

[crazy-weasel]

Describe the bug
With the "Isolate Workspaces" feature enabled, some flatpak apps need >90 seconds to start. It does not matter if the application is started from the panel, or from the applications menu. If the flatpak app is started via the terminal, it starts immediately.

Linux distribution and version
Debian Testing / Trixie

GNOME Shell version
GNOME Shell 46.4

Dash-to-Panel version
63

Where was Dash-to-Panel installed from?
The GNOME extensions website

Screenshots / Video captures
https://github.com/user-attachments/assets/923e6a94-adcd-405e-af48-22dc685394da

In the video:
Starting chromium at the 4 seconds mark, becomes visible at 01:43
Then disabling the feature and starting Chromium again at 01:55 and is visibly shortly after

Additional Info
Not all flatpak apps are affected. Reproducible on my machine with Chromium and Inkscape. Thunderbird starts normally, but the "Write New message" action from the context menu is also having the same issue.

[archekb]

Ubuntu 24.10 the same problem.
Ubuntu 24.04 have no problem.