Bug: High-pri setState causes primary tree to get unhidden

[gaearon]

Repro: https://codesandbox.io/s/fast-water-4i4jb

Notice the flash. I'd expect suspended to be true during the high pri render.

[gaearon]

Repro with two sibling components: https://codesandbox.io/s/vigilant-nightingale-deb0u. During the high pri render, we don't go into ProfilePage at all.