I am unable to view some questions that have been migrated away and subsequently deleted. I'm talking about the stub left behind by migration, which is automatically deleted after 30 days. I do have the privilege to view deleted posts. For example, on Science Fiction & Fantasy:
- https://scifi.stackexchange.com/questions/6453/does-e-really-equal-mc2?noredirect=1 (deleted by me) works
- https://scifi.stackexchange.com/questions/6680/why-do-we-capitalize-all-race-names-but-our-own?noredirect=1 redirects me to https://scifi.stackexchange.com/error?aspxerrorpath=/questions/6680/why-do-we-capitalize-all-race-names-but-our-own
Kevin remarks that the posts I can't view as a 10k user visible to mods, and indicated as “deleted” with no other indication. I can view the posts that are marked as “deleted by <user>” (whether the user is Community or a real user).
I was able to reproduce the issue on Unix & Linux where I have the 10k privileges but have never been a mod: I get the “something bad happened” page for U-1, U-2, U-3, … but I see the deleted stub for U+1, U+2, U+3, … I also get the error page for SO1, … On SO the threshold date is: migrated 2012-11-01 21:10 ok, migrated 2012-11-01 20:38 → oops.
So it seems that older migrations, before 2012-11-01, that were automatically deleted, left a stub that triggers a server-side error when viewed by 10k non-mods.