[2021] Is this a Bug since the new update??

I have a sandbox game going with 4 cities on 4 separate islands. All worker classes have been achieved and my production of needs and happiness items are flowing! My population for all 4 cities is about 30,000 each.

I went to the New World after the expedition unlocked it and spent about 15-20 minutes. When I went back to the Old World my population was down from 120,000 to 74,000. I panicked and clicked on one of my investor houses to find that some items like coffee, sewing machines etc. were not full. So I go into my warehouse to check on my stock and I'm showing at least 1000 or more of the items.

I go back into the investors house and the bars for the deficient items began to climb turning the bar from blue to green eventually. Then the population began to increase. I've found that I had to do this for each island by clicking on the warehouse and then on the houses to re-supply them. [censored]??? Why is this happening? I've never had to do this before...

Has this happened to anyone else since the update?