Playing RoG without SW enabled/linked & default settings... 1st play through started in Autumn, went through Winter & popped into a cave early Spring for light bulbs. Was out of cave within 2 or 3 in game days to find myself back at start of winter, although day count was still correct for early spring? I'll also just want to add that no Deerclops spawned in winter or Goose-Goose in early spring...
Deleted that game & started 2nd play through... Spring start, did Summer & popped into cave early Autumn. Only in for 3 or 4 days, came out to start of Spring. Went back into cave few days later, instantly started overheating, came out immediately to find I'm in height of summer. No D-Fly spawn in summer.
So the SW update has bugged regular RoG in a bad way with caves by changing the season it seems every time one enters/exits a cave. As for the lack of giants, I am aware they aren't guaranteed to spawn each season, but I've played RoG numerous time before the update & giants were fairly regular.
I also snagged some flotsam & got the sextant which has no image except for a small "1" when in my inventory or a chest...
Wilson>RoG (*No SW enabled)>Going in caves changes the season.