Here's another thread about the topic from 2018, with a more detailed analysis from me as well as participation from [v] and Elu. [v] gives some insight into how that happens, and it mostly seems to fit the situation here. Basically, it's ostensibly that good ol' race condition again, one of the hardest flavors of bugs to fix, so I understand why it's still there, bugging gameplayers on all sides occasionally.
There's a difference here, though: Many people in Libcord did see OP's nation as the Delegate, so it seems that the game saw that nation as Delegate for several seconds before being 'overwritten' with the previous stale value. It's hard to say how long that was, but it must certainly have been at least a few seconds. Based on what [v] wrote
here, that would imply that there was one operation that operated asynchronously from update and took a considerable amount of time. The delegacy change was happening ID 16826090 @ 2021-11-28 17:03:33+0000. A banjection occured with happening 16826133 @ 2021-11-28 17:03:41+0000, 8 seconds later, with the previous Delegate, so it's reasonable to assume that the action that caused the stale region write occurred between those two happenings:
11/28/2021, 6:03:42 PM GMT+1: European Bison Empire relocated from The New Order Last days of Europe to The Rejected Realms.
11/28/2021, 6:03:41 PM GMT+1: European Bison Empire was ejected and banned from The New Order Last days of Europe by Tamiel.
11/28/2021, 6:03:40 PM GMT+1: Christian Lindner II relocated from Artificial Solar System to The New Order Last days of Europe.
11/28/2021, 6:03:39 PM GMT+1: Emu Tribe endorsed Frinil.
11/28/2021, 6:03:37 PM GMT+1: Controlitia WA relocated from Artificial Solar System to The New Order Last days of Europe.
11/28/2021, 6:03:37 PM GMT+1: Preskovia 6 relocated from Artificial Solar System to The New Order Last days of Europe.
11/28/2021, 6:03:37 PM GMT+1: Reballic endorsed Frinil.
11/28/2021, 6:03:36 PM GMT+1: Stalenskaya Puppeteer endorsed Frinil.
11/28/2021, 6:03:34 PM GMT+1: Eolusia1 endorsed Frinil.
11/28/2021, 6:03:33 PM GMT+1: Astrophysics endorsed Lebazgh.
11/28/2021, 6:03:33 PM GMT+1: Grape Island endorsed Frinil.
11/28/2021, 6:03:33 PM GMT+1: Nreremeopahpera seized the position of The New Order Last days of Europe WA Delegate from Tamiel.
Those are just endorsements and moves, though, which we had always assumed to be "quick" unless one of those took longer than it otherwise would. Another possibility, I guess, would be that the banjection is the culprit, since that process logically loads two regions (this one plus TRR), and looking at the happenings both before and after the region updated, the invader delegate was banjecting incoming nations at about 1 nation every 2-4 seconds rather than the 14 seconds it took for between the last pre-update banject and the first post-update banject. So if there was a lag spike with a banject there that caused the stale region write, that would explain what we saw.
(theoretically, the culprit could be a happening issued before the delegacy change and written to storage after it, but I considered that scenario unlikely given how long it took for the stale region write)
EDIT: Tamiel just confirmed to me on Discord that they didn't have lag spikes and got several "unauthorized" error messages. That, plus the detail I missed about the 26 verified endorsements, might point to something else than the banjection, and rather something like ... an exception during update?
(see i told you liberations are literally impossible )