This PR doesn't really change anything except adding the test case.
I think the test case is still useful as a slightly more complex test case.
The underlying problem which this test case was reproducing was fixed on RETURNN side via https://github.com/rwth-i6/returnn/pull/1232.
This PR doesn't really change anything except adding the test case. I think the test case is still useful as a slightly more complex test case. The underlying problem which this test case was reproducing was fixed on RETURNN side via https://github.com/rwth-i6/returnn/pull/1232.