vcf export doesn't contain photos

[Kaligule]

Thank you for the amazing app.

The app workds fine pretty much all the time.
But when I export my contacts to vcf, the photos are missing.
The contacts are in there, all fields (as far as I can see) are there, just the contact-photos are missing.

What I expected

in the vcf-file the contacts have a field called PHOTO as specified in RFC6350.
The photo is encoded in base64 or something like this.

What I got

The PHOTO key is missing.
Here is an example (Name, Catergory and phone number changed, but everything else left as it was.
The contact has a photo in the app.

...
END:VCARD
BEGIN:VCARD
VERSION:4.0
PRODID:ez-vcard 0.11.3
FN:Max Mustermann
N:Mustermann;Max;;;
TEL;TYPE=CELL:+4912345678
CATEGORIES: Example Contact
END:VCARD
BEGIN:VCARD
...

version information

I run version 6.22.7 Pro from Fdroid on Android 11 (on a fair phone 4).

[deejayy]

I can report the same, no photo exported.

On the other hand, I couldn't find a way to import photos from vcf.

I tried:
PHOTO;ENCODING=BASE64;TYPE=JPEG:<base64 encoded string>
PHOTO;TYPE=JPEG;ENCODING=b:<base64 encoded string>
PHOTO;MEDIATYPE=image/jpeg:<url>
PHOTO;TYPE=JPEG;VALUE=URI:<url>

(app version is the same, xiaomi mi 9t, android 10)