What version of Shaka Player are you using?
v4.7.11-main-27-gb51e6615e-uncompiled

Can you reproduce the issue with our latest release version?
No.

Can you reproduce the issue with the latest code from main?
Yes.

Are you using the demo app or your own custom app?
The demo

If custom app, can you reproduce the issue using our demo app?
N/A

What browser and OS are you using?
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

For embedded devices (smart TVs, etc.), what model and firmware version are you using?
N/A

What are the manifest and license server URIs?
uri= https://vod.stream.vno.videofutur.fr/15ddedc0-6bc2-433d-9b35-6a78eb36b434/0565544-HORACE_62_HD_BOX-HD-FI.ism/Manifest(format=mpd-time-cmaf,encryption=cenc).mpd
license server= https://apitest-vod.azureedge.net/rest/v1/license/widevine?token=%2FO5MzhB9czOwDCshhWnt%2BnRNS8U3kysD4NLNlqqKpRiElyOtkxaFvw%3D%3D

What did you do?
I play a movie with subtitles, some of them being displayed over two lines.

What did you expect to happen?
In previous version, including 4.7.11, multiline subtitles are correctly displayed, as below:

What actually happened?
With the nightly version, subtitles are displayed on one line:

If I look at the DOM, I see this in v4.7.11:

And this in the nightly version:

The <br> tag is missing in the faulty version.

And here's the part of the VTT file that matches:

00:02:45.640 --> 00:02:48.280 align:center line:91%,end
<c.cyan>Voilà Antoine,</c>
<c.cyan>mon frère aîné.</c>

It seems to me that the VTT parser treats these 2 lines as 2 cues instead of 1 with 2 nested cues, and thus misses the insertion of the line break cue.