There are a couple of bugs I’ve noticed in 184.108.40.206
easy one first
File | Backup To…
The format of the name is project[current date and time]. In 1.0.3 I replaced the with an underscore and got the filename I expected. When I do the same in 1.2.1, however, it appends a space to the underscore, meaning I can’t create a filename without a space in it.
Note - I just checked, and it will create the filename I expect, but only if I remove the  from around the current date and time.
It would be nice if the behaviour of 1.0.3 could be restored for this operation, as the current workaround is rather clunky.
Scrollbar not being recalculated when a horizontal split is performed in scrivenings mode.
Take a document that covers at least a couple of screens and click horizontal split.
Scrolling down to the bottom of the scrivenings document is not possible, as the bottom few lines of text are covered by the second window, and the scrollbar isn’t recalculated to compensate for the smaller scrivenings window. The only workaround is to select a different document into the scrivenings window, then reselect the scrivenings document.
Note - this does work as expected in normal document mode, just not in scrivenings mode.