PSA for C1 transfers to Krisflyer (Singapore Airlines/ SQ): log out and log back in!
This is the second time this has happened to me this year, so I am making a post as an FYI to myself and to anyone else who ends up in this position.
KrisFlyer won't show you your updated points count until you log out and log back in. Or, at least, for me they didn't for 45 min. I'm pretty sure the transfer is instant. So FYI!
EDIT: Hitting refresh may not be enough, to be clear. Logging out and logging back in is the safest bet.