I have no direct experience, but apparently this is an historical problem. Way before the pandemic a friend of mine relocated to USA (from Italy) and started working for AWS as a product manager.

She did not last much and eventually jumped to another big company. Sure the job was challenging in AWS, but what she was complaining the most about was the speed at which people were leaving and being replaced.

She told me that she often had to schedule meetings with people from other teams/departments, sometimes 2-3 weeks in advance to find a free calendar slot, and when it was finally the date for the meeting, it often occurred that one of the invitees did not show up, without any prior notice, only for her to discover that the person resigned.

So very often she had to reschedule the meeting with different people and wait another couple of weeks for them to be available. This made it very frustrating and difficult for her to get things going, as she was a product manager for a product that required a lot of cross-team collaboration.