Theming App: favicon-touch / touchIcon not working

Using Nextcloud 15.0.5

If theming app disabled, favicon-touch is working and accessible (e.g. /nextcloud/core/img/favicon-touch.png)
If theming app enabled, no favicon-touch (touchIcon) is created by theming app.
data/appdata_xxx/theming/63/touchIcon-files is created but with no content.
Access error in browser, when using /nextcloud/apps/theming/icon/settings?v=63 (Content not valid)

In the nextcloud log I found following errors
[PHP] Error: filesize(): stat failed for data/appdata_xxx/theming/63/touchIcon-files at nextcloud/lib/private/LargeFileHelper.php#171
GET /nextcloud/apps/theming/icon/files?v=63
[PHP] Error: stat(): stat failed for data/appdata_xxx/theming/63/touchIcon-files at nextcloud/lib/private/Files/Storage/Local.php#142
GET /nextcloud/apps/theming/icon/files?v=63
[PHP] Error: file_get_contents(data/appdata_xxx/theming/63/touchIcon-files): failed to open stream: No such file or directory at nextcloud/lib/private/Files/Storage/Local.php#216
GET /nextcloud/apps/theming/icon/files?v=63

Any ideas?

Got same problem.
Cannot make favicon work with theming app

mee too long time ago, this known problem. I see there no one can support in this forum. it’s shame :frowning: