Pietato
Platonic Perfection
@Pfeffersack - Hmm, yeah I don't know. The only thing I saw that could of had a hidden trigger was researching Colonialism, but changing it didn't have an effect. There weren't any Barb camps left so that also wasn't a trigger. The two diplo exchanges also didn't seem relevant either. Definitely a conundrum.
*Edit - Something occurred to me. Could it have something to do with the Civs you are allied with? Someone hypothesized that before iirc (maybe you?). On turn 191 (before hitting next turn on your save), you are allied to two Civs (GC & Canada) that belong to SP, that's also the turn the logs says you and China (who is also allied to GC) both discover that specific SS.
We discussed the vamp base strength issue starting about here: https://forums.civfanatics.com/thre...iscussion-thread.660504/page-36#post-15851350
It would be noteworthy though if it only gains corps/army strength from hard built rather than merged units.
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Another interesting thing I discovered tonight was that if you're in an alliance with another Civ who belongs to the same SS, you accumulate 0.5 points per turn towards that alliance.
Cheers. Posted there as well.