I see this for unions and pipeline executes
I did some research on this. This warning from the platform is shown for snap threads that have not consumed any CPU for a while, since in some cases those threads might actually be stalled, not making progress when they should. However, many snaps naturally wait as part of their design, and for these, the warning is a false positive. Some such snaps like the Salesforce Subscriber are annotated to suppress the platform warning, but many other snaps that should be annotated in the same way are not yet, so the warnings that you see for those snaps can be ignored.
