Broken avatar on calendar picker when creating: `GET …/avatar/{user}/512/dark`

[nickvergessen]

Steps to reproduce

1. "➕ New event"

2. In right sidebar see the calendar picker

3. 

4. Click on it to select another calendar

Expected behavior

✨

Actual behaviour

Avatars are broken showing the placeholder:

Browser console says:

GET …/avatar/{user}/512/dark [HTTP/2 404 Not Found 55ms]

Calendar app version

4.1.0

CalDAV-clients used

No response

Browser

Firefox 106

Client operating system

No response

Server operating system

No response

Web server

Apache

Database engine version

MariaDB

PHP engine version

PHP 8.1

Nextcloud version

25.0.1

Updated from an older installed version or fresh install

Updated from an older version

List of activated apps

No response

Nextcloud configuration

No response

Web server error log

No response

Log file

No response

Browser log

GET …/avatar/{user}/512/dark [HTTP/2 404 Not Found 55ms]
GET …/avatar/{user}/512/dark [HTTP/2 404 Not Found 53ms]
GET …/avatar/{user}/512/dark [HTTP/2 404 Not Found 54ms]
GET …/avatar/{user}/512/dark [HTTP/2 404 Not Found 55ms]

Additional info

No response

[max65482]

Likely related to #4061