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No caption or wrong caption displayed when default text track is =/= from index 0

Created by: Gontran-Molotov

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/dash/vod/testpic_2s/multi_subs.mpd
Dash.js version: v2.6.8 to v2.9.0
Browser name/version: Google Chrome 69.0.3497.92
OS name/version: ArchLinux

Steps to reproduce

Open the reference player page http://reference.dashif.org/dash.js/v2.6.8/samples/dash-if-reference-player/index.html and select this stream: https://vm2.dashif.org/dash/vod/testpic_2s/multi_subs.mpd
Click on Show Options and type swe in the Text: field of the Initial Settings section
Click on the Load button

Observed behaviour

In dash.js v2.6.8 to v2.8.0, there is no caption displayed but if you open the caption menu in the controlbar, the swe: subtitles menu item is correctly selected.
In dash.js v2.9.0, the first text track (eng) is displayed while the swe: subtitles menu item is correctly selected.
The problem does not occur in v2.6.7