Repro case with a master build: https://codesandbox.io/s/stoic-mcnulty-dhygf?file=/src/App.js:668-703

Expected: we see content after a second.
Actual: fallback never resolves.

This happens in a sequence of:

1. Normal update
   - which suspends
2. Idle update
   - which also suspends
3. An unrelated normal update immediately followed by a ping (so they're batched)
   - here, we decide to stay on fallback, but should've shown the content

If you remove `_setVersion(v => v + 1);` on line 44 then the issue goes away.
state = {error: null};
        static getDerivedStateFromError(error, errorInfo) {
          return {error};
        }
        render() {
          if (this.state.error) {
            return `Caught an error: ${this.state.error.message}`;
          }
          return this.props.children;
        }
      }
      ReactNoop.renderLegacySyncRoot(
        <ErrorBoundary>
          <Suspense fallback="Loading...">
            <errorInCompletePhase>
              <AsyncText ms={1000} text="Async" />
            </errorInCompletePhase>
          </Suspense>
        </ErrorBoundary>,
      );
      expect(Scheduler).toHaveYielded(['Suspend! [Async]']);
      expect(ReactNoop).toMatchRenderedOutput(
        'Caught an error: Error in host config.',
      );
    });
    it('does not drop mounted effects', async () => {
      const never = {then() {}};