I’ve noticed a persistent sync lag between the browser version and the iOS app. Not a lag i guess, since it never happens.

Even after I’ve cleared my inbox on my computer, my iPhone still shows a notification badge for those same emails. It seems the app is relying on a manual pull/refresh to update the badge rather than a server-side push.

It would be great if the Proton Mail app could sync the "read" state in the background so I don't have to open the app just to make the red bubble go away.

Is this on the roadmap for a future update?

I switched to proton from gmail and google has been able to accomplish this since 2010 or so.