Visual Preview does not process all images.
In this case it stops at 89% R: 117.
A restart does not help either.

Try loading another folder then going back to this one and activate Visual Previews again.
I'm working to fix this in the next beta.

Beta 11 is out now which should fix this.

I had this problem yesterday with B10 and solved it by processing in 5.8. I downloaded B11 today and the first sequence I processed missed a file when doing Visual Preview. I suggest this has not been fixed.

I just went to different folder and then came back to the offending one and it rendered all the visual previews this time. Similar to the solution you proposed as a temporary solution. It still needs to be looked at. Good work as usual by the way.