On https://chromium-review.googlesource.com/c/chromium/src/+/1371813 some reorganizing of combination results from server and autocomplete attributes was done. As side effect, it may lead to the following:

Let we have password field P.
1.Server predication says that P is current-password.
2.Autocomplete attributes says that P is new-password.

As a result P is chosen as both new-password and current-password. 

It doesn't look that there are some problems with filling, but it might be a blocker for launching saving with the new parser in M-73.