TestScheduler can't be reused ? Doc is unclear.

Describe the bug

I simplified my problem to this : I reuse a scheduler for multiple test, reading the doc I thought this would be ok.

But unless I reset the frame at 0, the 2nd test will fail.

Is this expected ? If so that might need a clarification on the marble testing doc.

Anyway, thanks for the good work.

Expected behavior

Both test should pass without reseting the frame.

Reproduction code

const testScheduler = new TestScheduler((actual, expected) => {
  console.log(actual, expected, isEqual(actual, expected));
});

const test = (helpers: RunHelpers) => {
  const { cold, expectObservable } = helpers;
  const source = cold('---a--b--|');
  const expected = '   ---a--b--|';
  expectObservable(source).toBe(expected);
};

testScheduler.run(test);
testScheduler.frame = 0; // 2nd test fails if removed
testScheduler.run(test);

Reproduction URL

https://stackblitz.com/edit/rxjs-tucw4y?file=index.ts

Version

7.8

Start with the linked StackBlitz reproduction and the TestScheduler.run calls shown in the issue. Check whether reusing a scheduler without resetting frame is supported; done means the marble testing documentation clearly explains the expected reuse and frame-reset behavior, or the issue is redirected if documentation is not the appropriate fix.