The display in testing tool window is abnormal

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I found 3 issues about testing tool (Wing pro 7.2.1.2, Windows 10, Python 3.7.3 [MSC v.1915 64 bit (AMD64)]).

1. Sometimes(not 100% reproducible) when add a test file into testing tool window by "Add Single File", the file name is completely invisible in tool window. However the item is select-able, in this case only highlight bar shown, but no any text under the highlight bar.

2. After adding a new test file, test cases will only appear under the test file after running "run tests" TWICE.

3. Then if clear all results, check mark will be replaced by a question mark. The problem is that regardless of subsequent run of test case, it is pinned to question mark. Also the capture of test case output isn't reliable.

The framework unittest was used in above steps.