Bug? Beta 7 - Subtitle export greyed out

The options for exporting subtitles is greyed out, although I have a subtitle track in my timeline.

Mac OS 10.13.6
Mac Pro Late 2013
32 GB RAM
3,7 GHz Quad-Core Intel Xeon E5

are you trying to export a timeline as a single clip or individual clips? The latter will grey-out the subtitle options.

Why? I actually want the individual clips rendered at source resolution and with subtitles. If I render as one clip I cannot seem to select source resolution any more. What am I missing? Thanks!!

It has been a while but same here, is there a workaround? Is it available in the payed version? It's more than necessary for Short videos on YouTube.