Hi Philip,
Can you share a bit more about how you’re loading the new level here? Is this a blocking load, seamless travel, etc.? This sounds like it could be vaguely related to Ivan’s post [Content removed] where the invalidation root is lost as part of a level transition. If you see the FStreamingPauseRenderingModule delegate firing as part of the load, it may be worth trying to add that call to InvalidateAllWidgets in EndStreamingPause to see if it helps.
I’d also be curious if you see this in a packaged build or just within PIE. The inconsistency looks to start with STooltipPresenter, and I recall there being a bit of inconsistency between how tooltips are handled in the editor vs. runtime (since we want to host editor tooltips in their own SWindow).
Best,
Cody