No image of a freshly abraded rock has been uploaded to the JPL server as yet, and we've only received 10 frames of the abrasion operation so far (spanning about 10 minutes of work), so I'm not sure what to think. Did the rover sense a problem and end the abrasion early? As the animation shows, the arm and the abrasion bit actually shifted a bit during the operation, which is not unprecedented, but it may be that Percy stopped as a precaution.
All the other recent abrasions took longer than 10 minutes (between 15-25), so I can imagine that the process wouldn't quite be done. ~~An earlier post by Paul Hammond shows that Percy is currently very close to the site of abrasion patch #40, which was evidently easier to work with than this weak, fractured stuff, though it was only metres away from here.~~
The rocks on this great big crater rim are yielding amazing science, but they are damned finicky to work with.
EDIT: As of this sol (1544), Percy is about ~100 m east of the site of abrasion patch #40, and ~100 m west of abrasion patch #38. My apologies for the error!
Aside from those already listed in the other post, there's only one other patch for which I don't have a given name (#34, Sol 1395), so that's a total of four.
The drilling/abrasion tools on Curiosity and the MER twins have given us a good idea of the rock strength encountered by those rovers, but I haven't seen much research on the subject for Percy as yet. It's a little frustrating - that's a stat I'd like to include when writing up the different patches, it really would help tell a story. I know the mission has enough "drill parameter" data to make an interesting tale...
I'm sure they have a ton of drill data, hopefully they'll share something soon :)
As for your missing patch names looks like you have to wait until Early August for the next update