Today I created this TimedText page. In the old player, at 14.75 seconds the caption has a <br> inserted where there is a line break in the TimedText file, but in the beta player the line break is displayed as a normal space due to not being converted to a <br>.

To fix this, presumably either the line breaks would have to be converted automatically, or CSS like .caption-cue { white-space: pre-line; } would have to be added.