Android TV Plex app - Resuming movie (play from last position) failed on files (.mp4, .mkv) with Lavf writing library (Lavf58.20.100, Lavf58.35.100), when using external subtitles (.srt).
Workaroud: - unselect subtitles before resuming - resume movie - reselect subtitles in player menu.
Server on W10 Intel Core i3, Player on Philips Android TV PUS7304.
Remux (eg. with mkvtoolnix) helps, with new file (libebml + libmatroska) resuming works normally.
And… as i remember, on december versions it works OK…
Server Version#: 1.25.3.5409
Player Version#: 8.29.0.30433