Export contacts to a .vcf file fails when any contact contains a Telegram user name

[andreashuber69]

See title. I've reproduced this in a new profile with freshly installed Right Contacts app:

1. Create a new contact with a first name and a Telegram user name.
2. Export contacts to a .vcf file.
3. Error message pops up: java.lang.IllegalArgumentException ...

(Tested on GrapheneOS)