PMS Can't find .srt file over SMB + UNC - stops transcoder

Server Version#: 1.20.3.3483-211702a9f Windows 10.0 (Build 19041)
Player Version#:5.3.1 19_MUSEM_QTV
Media on Synology device

Lately I’ve been having a lot of transcoder errors. Browsing through the “plex Media Server.log” the following sequence appears as I tray to play Carnival Row - S01E01 - Some Dark God Wakes - WEBDL-1080p-AMRAP.mkv with dutch subtitles on (named as the file but with .nl.srt as an extension):

Nov 08, 2020 01:19:18.742 [3992] DEBUG - Calculated media file path for path [file://synology/Series/Carnival%20Row/Season%2001/Carnival%20Row%20-%20S01E01%20-%20Some%20Dark%20God%20Wakes%20-%20WEBDL-1080p-AMRAP.nl.srt]: [“synology/Series/Carnival Row/Season 01/Carnival Row - S01E01 - Some Dark God Wakes - WEBDL-1080p-AMRAP.nl.srt”]
Nov 08, 2020 01:19:18.742 [3992] ERROR - Couldn’t find the file to stream: synology\Series\Carnival Row\Season 01\Carnival Row - S01E01 - Some Dark God Wakes - WEBDL-1080p-AMRAP.nl.srt
[…]
Nov 08, 2020 01:19:18.742 [2416] ERROR - [Transcode] Error configuring transcoder: TPU: Failed to download sub-stream to temporary file
Nov 08, 2020 01:19:18.743 [2416] DEBUG - [Transcode] Streaming Resource: Terminated session 0x46e5ce8:23yx86j45x17yne1j0dshhj5 with reason Conversion failed. The transcoder failed to start up.

Since the file is accessed over SMB, I noticed that at least in the log files, the \ is missing in front of the .srt file.

Placing the media on a local drive fixes the issue. So does mapping the \synology\Series share to a Z:. But UNC paths (not ending in a \ or /, I checked!) don’t work in this situation.

[EDIT] Even here a double \ translates to a single \ in the sentence above.
test:
hashtag slash slash: #\
accent slash slash: '\
slash slash slash: \
slash slash slash slash: \\
slash slash slash: \\

weird.

This is a known issue and is fixed in the latest PMS 1.20.4.

It’s like going to the doctor and the pain is gone… Thanks.

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