Phonetrack: no map shown in public shares

Hi all,

i created a new instance of nextcloud 20 on my raspberry pi 3.
I installed Phonetrack 0.6.5 via the Admin panel.

I can create Tracks via my android phone and the phonetrack-android app.
I can also watch them in case i log into my instance.

Now i want to share my latest positions / Tracks via the public links.
It seems like the raspberry does not load the entire site. The map is missing:

This is how i got from my firefox:

in /var/log/apache/

`

    • [16/Nov/2020:22:44:01 +0100] “GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1” 304 867 “-” “Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0”
    • [16/Nov/2020:22:44:03 +0100] “POST /index.php/apps/phonetrack/track HTTP/1.1” 200 947 “-” “Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0”
    • [16/Nov/2020:22:44:18 +0100] “POST /index.php/apps/phonetrack/track HTTP/1.1” 200 1507 “-” “Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0”
    • [16/Nov/2020:22:44:31 +0100] “GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1” 304 867 “-” “Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0”
    • [16/Nov/2020:22:44:33 +0100] “POST /index.php/apps/phonetrack/track HTTP/1.1” 200 947 “-” “Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0”
    • [16/Nov/2020:22:44:48 +0100] “POST /index.php/apps/phonetrack/track HTTP/1.1” 200 1507 “-” “Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0”
    • [16/Nov/2020:22:45:02 +0100] “GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1” 304 867 “-” “Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0”
    • [16/Nov/2020:22:45:04 +0100] “POST /index.php/apps/phonetrack/track HTTP/1.1” 200 947 “-” “Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0”
  • willhelm [16/Nov/2020:22:45:14 +0100] “PROPFIND /remote.php/webdav HTTP/1.1” 207 4772 “-” “gvfs/1.46.1”
    • [16/Nov/2020:22:45:19 +0100] “POST /index.php/apps/phonetrack/track HTTP/1.1” 200 1507 “-” “Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0”

`

Thanks in advance for help
Willhelm

Update 2020-11-19
in gitlab a found this issue:

This sounds familiar.