fwiw, I backed off to 1.8.20 and got a similar degraded report but when I backed off to 1.8.10 the report was back to 100%.
@Sergey Shanshin does this look like a Kover issue to you, or do you test with the latest Kotlin versions, as I would guess you do, such that you know it is my problem to solve. I'm guessing it is something in my code or project configuration. 😞