Yes, I've done it on several computers, admittedly all running the same Chrome version and profile (sync'd together).
Trying to edit this segment https://www.waze.com/editor/?zoom=4&lat ... 34&env=usa
When I clean up the unconfirmed turn on node A, and save, it appears to clean up and save. But then if I immediately close my browser and open it again and browse back to the WME, that segment is again highlighted as having an unconfirmed turn on A.
I can try on Internet Explorer 10 on my work computer, which has never been to the Waze site before and not loaded WME. I know IE isn't necessarily supported but just to ensure it has no extensions, nothing in the cache, etc. Stand by.
I tried another nearby segment under IE 10. This
segment also has an unconfirmed turn on A. I corrected that manually (remember, no extensions or scripts), saved, and then closed IE and reopened it, reloading WME, and the unconfirmed turn appeared again.