@jayeless I'm not absolutely sure how my CMS handles this but afair(!) each reply gets it's own tiny html snippet that the parser gets to see while the user gets redirected via html meta refresh (not JS) to a threaded view (that also has all the data and could be parsed as well so here you get multiple nested in-reply-to (and probably h-cites)). This (or different request from text/html) is probably here the case as well so the parser gets not multiple or nested u-in-reply-to when beeing triggered by a Webmention but a single h-entry comment.

What I get from comments with others are in-reply-to (and reply-of) links pointing to an individual comment h-entry allowing my system to make a threaded comment ouf of it on my end again. This works and allows for threaded comment views.

Thing is that this in-reply-to here seems to point to your original post not to an individual comment you actually replied on. Your comment (10667116) has no trace of beeing a reply to 10668107 when parsing it's source origin (url), see php.microformats.io (this is what the parser sees following the source link)

So I only got a notification (mention, alert, whatever) and comments never show up on my end, which kinda defeats the purpose of this (e.g. allowing me to read comments and reply in my own reader or display them on my own website).

See also: indieweb.org/reply

Link to the original

This is from my understanding broken :-(

For reference a working example: php.microformats.io

A CC @manton may be in order.