Invalid To address when pasting reverse alias w/ display name into Proton Mail

[Opening-Button-8988]

• I have searched open and closed issues to make sure that the bug has not yet been reported.

When I copy a reverse email address (with display name) into Proton Mail, the address becomes invalid. The To address becomes red and shows an exclamation mark, and the address becomes split up. I don't remember this happening before. This also occurs when clicking on Begin composing with default email.

This doesn't occur when copying the one without display name.

Proton Mail Android, v4.15.0 from Aurora Store
SimpleLogin Android v1.22.0 from F-Droid

[Elekam]

This also happens to me in the Webapp on Firefox 145.02 on Windows.
I paste the reverse-alias in, which begins with "Lastname, Firstname ....". It gets cut off like this:
"Lastname" "Firstname ...".

The first is marked as invalid, the second is still valid because it contains the rest of the mail address. The ", " between Lastname and Firstname disappears.