Annoying iMovie message

[chars1ub0w]

There's an annoying iMovie message that only recently has been plaguing me.
I make a few movies and each time after finishing, I close iMovie.
But recently, it has been refusing me, saying it's still doing something.
Okay, I let it stay for a day or so, and it still doesn't let me close, so it seems like a bug.
I have to force close it.
This is on a M1 Max MacBook Pro with 64GB RAM so I am not short of compute power.
I am running the latest macOS Sonora.
It happens with both 14.2 and 14.3.
Anyone else have this?

 

[Matmania]

Out of curiosity, what taks are being performed when you look at activity indicator?

 

[chars1ub0w]

Out of curiosity, what taks are being performed when you look at activity indicator?

As you can see on the toolbar in the screenshot there are no tasks being performed.

 

[chars1ub0w]

And I can't see anything relevant in Activity Monitor either.