Playback issue but transcoding works

[Peronia]

I configured no published server URI. I configured only HTTPS (with a valid Let's Encrypt certificate) and IPv4 only.

Thanks for the hint with the dev console, I got this (more than 10 times):

Code:

HLS Error: Type: networkError Details: fragLoadTimeOut Fatal: false main.jellyfin.bundle.js:2:97852
    _ https://example.com:8920/web/main.jellyfin.bundle.js?d5f64bca077b6d6aaf33:2
    emit https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    trigger https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    loadtimeout https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    loadtimeout https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    (Async: setTimeout handler)
    loadInternal https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    load https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    onFragLoading https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    onEventGeneric https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    onEvent https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    emit https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    trigger https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    _loadFragment https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    _fetchPayloadOrEos https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    _doTickIdle https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    doTick https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    tick https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    onLevelLoaded https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    onEventGeneric https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    onEvent https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    emit https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    trigger https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    _handlePlaylistLoaded https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    _handleTrackOrLevelPlaylist https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    loadsuccess https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    readystatechange https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    (Async: EventHandlerNonNull)
    loadInternal https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    load https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    load https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    onLevelLoading https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    onEventGeneric https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    onEvent https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    emit https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    trigger https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    setLevelInternal https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    set https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    set https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    set https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    startLoad https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    startLoad https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    startLoad https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    onManifestParsed https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    onEventGeneric https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    onEvent https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    emit https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    trigger https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    onManifestLoaded https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    onEventGeneric https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    onEvent https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    emit https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    trigger https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    _handleMasterPlaylist https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    loadsuccess https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    readystatechange https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2
    (Async: EventHandlerNonNull)
    loadInternal https://example.com:8920/web/4291.b963b8b61cf8a9570109.chunk.js:2

I read that this could be a browser bug, but I have the same behavior at the Cromecast...
I try to set the published server URI but this does not solve the problem, so I removed it again.