I've been experiencing this odd behaviour with a few portals now, both power apps portals and Customer Service whereby CSS takes a long time to update on the portal. This is whether CSS is updated directing in the PowerApps Studio or via CLI in VS Code.
This happens both to the standard theme.css and a custom CSS file. For example, we make changes to the CSS file, around 15-20 mins later it finally updates on the portal. Have also refreshed the cache each time.
Anyone else experienced this before?
Thanks,
James