vscode-python-test-adapter: [pytest] test states not displayed

When using pytest the icons in the test explorer remain gray (no matter if tests fail or pass).

The output shows the following (I had to mask actual paths and names):

2023-01-25T15:28:40.343Z INFO pytest at 'xyz': Reading configuration for workspace xyz
2023-01-25T15:28:40.344Z  DBG pytest at 'xyz': usingNewInterpreterStorage feature flag is 'true'
2023-01-25T15:28:40.344Z INFO pytest at 'xyz': Using auto-detected pythonPath /<path>/python
2023-01-25T15:28:40.345Z INFO pytest at 'xyz': Running tests using python path '/<path>/python' in /<path>/xyz
2023-01-25T15:28:40.346Z INFO pytest at 'xyz': Loading environment variables file /<path>/xyz/.env
2023-01-25T15:28:40.352Z INFO pytest at 'xyz': Running pytest with arguments: --rootdir=/<path>/xyz, --junitxml=/<tmp-path>/tmp-7245-mawg3A03U6qr, --override-ini, junit_family=xunit1, /<path>/xyz/tests/test_xyz.py::test_xyz1
2023-01-25T15:28:40.353Z INFO pytest at 'xyz': Running pytest as a Python module
2023-01-25T15:28:41.960Z INFO pytest at 'xyz': Test execution completed

When I click on “Debug this test” the following output is shown in debug terminal:

============================= test session starts ==============================
platform linux -- Python 3.11.0, pytest-7.2.0, pluggy-1.0.0
rootdir: /<path>/xyz/tests
collected 1 item
==DISCOVERED TESTS BEGIN==
{"tests": [{"id": "test_xyz.py::test_xyz1", "line": 251}], "errors": []}
==DISCOVERED TESTS END==

../../../../../../../<path>/xyz/tests/test_xyz.py . [100%]

============================== 1 passed in 1.41s ===============================

Python version is 3.11.0 (also reproducable with 3.10.4 and 3.8.3). Python Test Explorer version is 0.7.1 Running VSCode 1.74.0 on Linux (SuSE SLE15)

No problems when switching to unittest, however most of our test suite is designed for pytest. Any help would be appreciated!