Android app not connecting to Server with self signed certificate

Hello everybody. I host my own server on a domain like xxx.yyy.com and I have created a certificate for DNS *.yyy.com and used it for my Plex server (and for other servers like a FTP). While connecting to xxx.yyy.com:32400 works just fine (the browser does see the connection as secured), the same doesn’t happen with the Android app. It refuses to connect to the server unless I allow unsecured connections. Does the Android app even support connecting to servers using self-signed certificates?

Server Version#: 1.28.2.6151
Player Version#: 9.8.2.35221 (or 9.30.0.3604)

This server version is over 1 year old.

@OttoKerner I can confirm it is still happening in Media Server v1.32.5.7349-8f4248874 with Android app version v9.30.0.3604.