Imported contacts cannot be mailed to in groups

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• Nextcloud Server is running on 64bit capable CPU, PHP and OS.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

Some imported contacts from Gmail using a .vcf file (which ones i cant tell) dont have an email type set by default, which prevents from sending a group mail to a group within which they are. Nextcloud just refuses to make the "email application choosing" window appear, probably because it cannot read their email adress as such.

Steps to reproduce

1. Export Google contacts into a .vcf file
2. Import them to Nextcloud from the Contacts pannel
3. Some contacts don't have a Email type set by default ("Domicile" "Travail" and "Autres" stand for "Personal" "Work" and "Other"): https://i.imgur.com/XYlD2mP.png
4. Create or use an already existing group in which one or several of these contacts will be
5. Try sending an email to the whole group through the Contacts UI: https://rimgo.esmailelbob.xyz/IPyq35h.png
6. Nothing happens.

Expected behavior

On computer, the web-browser should prompt me with a window asking me for which mail app i want to use, or send me straight to the mail app i chose before if i did so.

Installation method

None

Operating system

None

PHP engine version

None

Web server

None

Database engine version

None

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

No response

List of activated Apps

None i'm aware of. Cannot say for sure as i'm not an admin.

Nextcloud Signing status

No response

Nextcloud Logs

No response

Additional info

May be related to this issue:

• https://github.com/nextcloud/contacts/issues/3195

Start by reviewing the related Contacts issue #3195, then reproduce the Gmail .vcf import and group-mail flow described here. Confirm how imported contacts without an email type are represented and verify that selecting group mail opens the configured mail application for those contacts.