Same for the 3 5e campaigns I played in, which had 2 different DMs running them. Occasionally we'd hear references to something the previous group had done or get to see how a situation we thought we resolved ended up coming unravelled after we left so we'd have to figure out a different way of dealing with it. IMO it makes the world feel more alive when the previous campaign events impact the current campaign.For all of 5e days I have run several campaigns in the greater Phandalin region. A few follow each other and built upon the last one such as the town has been redrawn to increase in size with a gold boom and new NPCs are encountered and the old ones still come up. My son seem to hate Harbin Wester in all the campaigns. I did run a Leilon and a PotA in Red Larch campaign that did not really go back and forth to Phandalin. The timeline never seems to come up other than one Phandalin campaign following the next in the next year, whatever year that is- but it does not matter.