@janrif Hi - one thing I can't understand is why you insist on running on the Snapshot releases. Snapshots are by definition unstable and buggy.
Especially after major releases the Stable branch gets the critical updates first, while Snapshot users have to wait for the next round of testing builds for fixes. Currently the Stable builds are a couple releases ahead of the Snapshots.
Running Snapshot/beta builds will always run the risk of bad bugs, crashes and possibly even critical data loss. For those not able to deal with that, and not able to secure their data properly through backups then Stable releases are recommended.
Also, since you seem to be a user of the Vivaldi Mail client, I don't see how moving to Edge or any other browser will help with that. No other browser has a built-in mail client. You'll have to install and learn another mail client as well.