tiki-list_comments.php does not parse comments in column "Comment", regardless of whether section_comments_parse ("Parse wiki syntax in comments in all sections apart from Forums") and feature_forum_parse (Accept Wiki syntax) are enabled.
This is a regression from r20794 / r22511.
I had a go at this, thinking it was an easy one and needless to say, it's no so...
The parsed version of the comment is currently (in 12.x) available in a tooltip which shows if you hover over the "Comment" column. I tried swapping these round but truncating the parsed comment data doesn't work, so you get quite tall rows which messes up the layout of that list. I tried adding some css to add scrollbars but it looks like a mess, so have given in.
I didn't even work out how to deal with the two different prefs relevant depending on the object type... i have attached a patch to this wish in case anyone else can think of a clean fix.
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To help developers solve the bug, we kindly request that you demonstrate your bug on a show.tikiwiki.org instance. To start, simply select a version and click on "Create show.tikiwiki.org instance". Once the instance is ready (in a minute or two), as indicated in the status window below, you can then access that instance, login (the initial admin username/password is "admin") and configure the Tiki to demonstrate your bug. Priority will be given to bugs that have been demonstrated on show.tikiwiki.org.