Reverse email address not added to ProtonMail

This is on Android

When using the SimpleLogin app to send an email from an alias, I have the following window pop-up

simplelogin

When I click on "Begin composing with default email" I get to select my email app and I choose of course ProtoMail.

Instead of the reverse email automatically filled in I get an error message though. Two actually, one in the address field and one below, "attachment not found"

Error

I don't get this error if I select Fairemail as the client.

Of course I can just copy/paste the address, but it's a bit of a hassle.

Am I doing something wrong here? Is there a setting that I'm not aware of?