If you've ever decided to bring Challenges back after this round of experiment, please have the deleted posts at the bottom of the page. This issue exists with Discussions as well (same UI), but it was not as annoying there since only a handful of posts have had that many replies, especially long ones (deleted and non-deleted).
I understand that only moderators (Discussions Mods or Diamond Mods) have this issue, but this is still a critical one as it makes navigating the page and doing any sort of moderation extremely difficult; see the screen capture*. Moreover, everyone would like to see expanding curation abilities of users, for Discussions (and Challenges), including showing deleted Discussions and Challengesreplies (and submissions) to 10k+ rep users. So when/if that happens, this issue would affect more users.
I ended up writing my own userscript to collapse the deleted posts, but I'd rather have them at the bottom and not in the middle of everything.
* Only if we could upload Animated WebP, this is the best quality gif that I could manage to get under 2MiB.

