Some quest/deed trigger bugs.  No save files or diagnostics.  All 3 are sporadic (have occurred only once each).

Win 10 (64-bit), 1920x1200

Version V1.5.13 S3 (64-bit) -- (I think; all of these were played in the last ~2 weeks)

1. (faction) Vaulters faction quest #3(a) Mission Centre fails to recognize that Winter Shelters has been built

Building the Winter Shelters city improvement in my capital didn't satisfy this quest chapter.  (IIRC, I also finished the Megapole and some other things in the same turn)  Thereafter, the faction quest was stuck here, even after I had 6 more improvements in my capital's list after Winter Shelters.  Destroying Winter Shelters and building it again has no effect.  (So I had to abandon that game.)

Not reproducible.

1.b (typo) In this quest, improvement "Winter Shelters" (plural) is misspelled as singular "Winter Shelter".

2. (deed) Market Alchemist triggers after producing only 3 of first 4 strategics

I had produced many Titanium and Glassteel, and owned Palladian from a quest, but had never produced, nor ever owned, Adamantian (but had 3 Adamantian Extractors in 3 build queues).  On the turn I first completed a Palladian Extractor and produced Palladian, I completed the Market Alchemist deed.  The +80 Adamantian reward for this deed was the first time I'd ever owned Adamantian in this game.  My production of Adamantian was still 0 per turn.

3. (quest) Reliable Ally expiration duration does not scale up with Endless game speed

In an Endless/Endless game, I received the quest around turn 16, and it expired on turn 36, before the 1st plan on turn 40.  So I never even had a chance to adjust my empire plan.