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Caption selection broken in nightly in reference player

Created by: davemevans

Environment

The MPD passes the DASH-IF Conformance Tool on http://dashif.org/conformance.html
The stream has correct Access-Control-Allow-Origin headers (CORS)
There are no network errors such as 404s in the browser console when trying to play the stream
The issue observed is not mentioned on https://github.com/Dash-Industry-Forum/dash.js/wiki/FAQ
The issue occurs in the latest reference client on http://reference.dashif.org/dash.js/ and not just on my page

Link to playable MPD file: https://vm2.dashif.org/livesim/testpic_2s/multi_subs.mpd
Dash.js version: nightly
Browser name/version: Chrome 66
OS name/version: Win7

Steps to reproduce

Load https://vm2.dashif.org/livesim/testpic_2s/multi_subs.mpd, confirm English subtitles are displayed.
Switch subtitles to any other language.

Observed behaviour

No subtitles are displayed, in any language. The network trace shows that the English subtitles are still being requested from the server, regardless of the selected language.

Subtitle language selection worked in v2.7.0