Yes, the Find pane accepts input and found the text entered. Nav pane worked with no errors.
Thanks for your testing! I'm dithering about when to merge the new PR: I may delay the merge a bit to facilitate further testing. I'll say more about testing in another ENB.
If anyone is in a hot rush, they can always check out the master branch, the official branch of Leo 6.8.8. That will revert a lot of work, but there have been no reports of bugs against 6.8.8.