Bug Test Runner does run tests when docked and "Maximize on Play" checked

If I dock the Test Runner window, and run tests while "Maximize on Play" is checked, it seems as though the tests run, but the test results indicate that all of the test did not run:



If I untick "Maximize on Play", all the tests run fine:


The tests also run fine if the Test Runner windows isn't docked, regardless of "Maximize on Play".

Anyone have any idea what would cause this behavior?

 

It took me a year to forget that I already ran into this problem. I just ran into it again with Unity 2018.3, and did a search to find details, and found my own unanswered post. I'll file a bug report.