Dianlight: Plex Media Server NAS - only SMB1 works!

I use the third party Add-on

Great Work. Helps me getting access to my local library with PLEX via home assistant.

I got it running, but had problems with access of my files.
In plex console I got errors: “error opening file” … “stale file handle (116)”

Only way to get around this is to set “cifsversion: ‘1.0’” in the configuration and in my Fritz.box, which serves as the NAS server.
No other cifsversion worked, dispite Fritzbox 7490 is capable of samba up to 3.0.
Accessing the NAS files via windows explorer is possible with smb 1 turned off in windows10 settings.
So it looks like “Plex Media Server” addon is using smb 1.0, regardless what I set in the configuration of the addon. (tested it with 2.1, 3.0)

Add-on version: 2.4.2-dht2
You are running the latest version of this add-on.
System: Home Assistant OS 5.10 (armv7 / raspberrypi3)
Home Assistant Core: 2021.1.5
Home Assistant Supervisor: 2021.01.7

Hope this is the right place to post this.
Would be good to get this fixed for security reasons.