Shield TV Pro: Forced subtitles not being forced

Server Version#: 1.29.2.6364
Player Version#:9.11.1.36576

Content is .MKV with subtitles forced when required. Lately, when playing content with forced subtitles the subtitles are not displayed. When I check playback settings, the forced subtitle is enabled. If I switch it off, then back on, it works. This just started happening recently. I recently switched my Plex server from Windows to Linux, but I wouldn’t think that was the issue since the content is being streamed via DirectPlay.

UPDATE: When I check the dashboard of the Plex server, it thinks that subtitles are enabled.

Any ideas?

Well. Looks like this was just fixed in 9.12.0.36838! Excellent!