Behaviour also present with a repeater-clock (chained 3-tick repeaters). Loading of old world => Repeater somewhere in the middle was active but not pushing forward the signal.
Same thing for Pillager Outpost -> not spawning pillagers
Guardian farm -> no longer sees location as "monument"
Using old map (1.14) in 1.18 pre-1
I guess this issue can be closed.
After the released 1.18 seed-info on chunkbase, i do see the "new" map-content.
The 1.18-seed map does show a humongous "cold" region at the same location for the 1.14-seed.
So i guess the resolution is "expected behavior as implemented"
However the transition on water between chunks could be a little less straight edgy. (see previous images)
Images comparison seed loaded in 1.14 vs 1.18
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Issue also on AMD Ryz5 with RTX3060, drop in FPS of about 15 to 20%
with huge spikes in FPS-decrease when entities appear in POV