Sharing recording as guest triggers internal server error

[fancycode]

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Steps to reproduce

1. Be a guest user on c.n.c
2. Get invited to a room and promoted to moderator there
3. Host a meeting in that room and record it
4. After the meeting, receive a notification that the recording is now available
5. Click the button to share it in the room

Expected behaviour

The recording should be shared in the room

Actual behaviour

The POST to /ocs/v2.php/apps/spreed/api/v1/recording/12345/share-chat?fileId=12345&timestamp=12345 receives a 500 Internal Server Error with this response:

{
    "ocs": {
        "meta": {
            "status": "failure",
            "statuscode": 996,
            "message": "Internal Server Error\n"
        },
        "data": []
    }
}

Ping me for internal details (room token, request id, etc).

Talk app

Talk app version: (see apps administration page: /index.php/settings/apps)

Custom Signaling server configured: yes/no and version (see Talk administration settings: /index.php/settings/admin/talk#signaling_server)

Custom TURN server configured: yes/no (see Talk administration settings: /index.php/settings/admin/talk#turn_server)

Custom STUN server configured: yes/no (see Talk administration settings: /index.php/settings/admin/talk#stun_server)

Browser

Microphone available: yes/no

Camera available: yes/no

Operating system: Windows/Ubuntu/Mac/...

Browser name: Firefox/Chrome/Safari/...

Browser version: 124/125/...

Browser log

``` Insert your browser log here, this could for example include: a) The javascript console log b) The network log c) ... ```

Server configuration

Operating system: Ubuntu/RedHat/...

Web server: Apache/Nginx

Database: MySQL/Maria/SQLite/PostgreSQL

PHP version: 8.1/8.2/8.3

Nextcloud Version: (see administration page)

List of activated apps:

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your server installation folder

Nextcloud configuration:

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your Nextcloud installation folder

Server log (data/nextcloud.log)

Insert your server log here