MW 1.19 is a LTS published 2012 but the life cycle ended in 2015 already.
Fandom has used it as its wiki base but adopted a lot of functions and functionalities; in result al lot of standard behaviour also fails with fandom implementation (logevents for example).
fandom is going to update its platform to MediaWiki 1.33:
- https://community.fandom.com/wiki/Help:MediaWiki
- https://community.fandom.com/wiki/User_blog:MisterWoodhouse/Unified_Community_Platform:_The_Vision,_Purpose,_and_Process
Our MW 1.19 tests fails due to UCP upgrade (see T268971)
Anyway due to the different MW 1.19 implementations pywikibot 2.0+ wasn't established to be used at fandom but compat (1.0) release is hte preferred one (https://pybot.fandom.com/wiki/Windows_installation)
Therefore I propose to give up 1.19 support with next Pywikibot 6.0 release in 2021 and start supporting with the LTS successor 1.23 published in 2014 e en its life cycle ended already 2017. See https://www.mediawiki.org/wiki/Version_lifecycle