--last-failed --last-failed-no-failures none is now collecting much more tests than it did in 5.4.3

Hi, in work I have been recently upgrading from pytest 5.4.3 -> 6.1.2, I observe a behaviour discrepency in the:

pytest_collection_modifyitems hook, in 5.4.3 given our setup we get the following:

pytest --last-failed --last-failed-no-failures none 

    # internal plugin registered via pytest_plugins=[]

    @pytest.hookimpl(trylast=True)
    def pytest_collection_modifyitems(self, items: List[Item]) -> None:
        try:
            for item in items:
                log.debug(f"collected item: {item.name}")
            do_something()
        except Exception as exc:
            pytest.exit(str(exc))

In the above snippet, the import thing is len(items) is 2. inline with this:

{
  "scrubbed/sensitive/info/test_two.py::TestTwo::test_two": true
  "scrubbed/sensitive/info/test_one.py::TestOne::test_one": true
}

I upgraded to 6.1.2 and with the same last failed cache highlighted above, len of the items in my hook implementation above is now pretty much every single test we have, 2600+.

note: This is barebones at the moment, scrubbing sensitive info is going to take a while

Reproduce the command pytest --last-failed --last-failed-no-failures none with the shown pytest_collection_modifyitems hook under pytest 5.4.3 and 6.1.2, using the described last-failed cache. Compare the collected item count and confirm whether the newer behavior returns only the two cached failures rather than 2600+ tests.