Correct--only FEI and DWI should have variable harvests. The rest should have 7-day harvests--I'm sure the devs will speak with Tom soon and get that fixed.
Should have had. I'm not sure if seasons actually had any effect on FEI, but I know that harvests are now fixed, at least on Dwi. Production varies, but not harvest length. At least, that's what was announced a while ago, and what I saw IG seems to confirm it.