I am using the latest version of pwb and reflinks (with just last merged changes) but it started to post incorrect edit summaries since upgrading to pwb 5.0.0:
https://ru.wikipedia.org/wiki/Special:Contributions/Rubinbot
Now it just adds "Pywikibot 5.0.0" but it used to have a customised edit summary in the script (i18n/reflinks.py)