Tim Visher, who used to publish the much-missed VimGolf in Emacs videos, just tweeted a useful tip:

OMG I have been looking for #emacs `org-list-repair` _forever!_ https://t.co/QMeulfO4KD (sorry if the link breaks, I can’t figure out to get a stable link to a line like in github). — Tim Visher (@timvisher) June 19, 2019

I played around with it a bit but couldn’t get it to fix the thing that most often troubles me: badly indented continuation lines in a list. It did fix some other indentation errors though. If you often have problems with list indentation, try it out to see if it helps.