Why is docker compose pull resetting some SSO log-in? (logged in PWA + Chromium)

[KusAdama]

I have Pangolin and am using a service as a PWA (Chromium). The app will load the SSO log-in first. I will put in my credentials/2FA and can use the PWA (on/off the app) indefinitely as the cookies are stored.

At least that's what I thought. It has happened to me several times that after the compose pull (not restart - compose down/up doesn't do this), all the PWAs must be logged in again.

The same service in a normal browser window remains intact. I don't know what can cause the stored credentials to reset.

I think as of now it's not a bug, but rather some quirks of Chromium (on multiple devices, Ungoogled and normal Chromium) PWA.

But I can't figure out what causes this?

It's really inconvenient because the service is well suited for PWA (no search bar, more space for its content), and I'm not in the place where it's being used to log anyone back in.
So now I can only update Pangolin when I'm nearby the devices.