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This is a refactor of the fix in #27505. When a transition update is scheduled by a popstate event, (i.e. a back/ forward navigation) we attempt to render it synchronously even though it's a transition, since it's likely the previous page's data is cached. In #27505, I changed the implementation so that it only "upgrades" the priority of the transition for a single attempt. If the attempt suspends, say because the data is not cached after all, from then on it should be treated as a normal transition. But it turns out #27505 did not work as intended, because it relied on marking the root with pending synchronous work (root.pendingLanes), which was never cleared until the popstate update completed. The test scenarios I wrote accidentally worked for a different reason related to suspending the work loop, which I'm currently in the middle of refactoring. DiffTrain build for commit https://github.com/facebook/react/commit/ee7f6757c446c4e79ecc7e2bc22b8c9b712834b7.