Freezing when duplicating clip.

[ini]

There is freezing ploblem when I dupliacate clip,
I can not generate this bug always, the symptom is like below.

when it occures,the duplcate clip fuction works, and any act to trying to edit or interact with tvp, any shortcut, any tool bar, any menu, does not works, I can not interact with tvp window at all, but exept only the 'close button' on the tvp window. when I try exiting tvp, finally 'tvp's save warning window' opens. so I can save the project. that's the only thing I can do.
That's the only way to interact with tvp, when It occurs, I have to close tvp with saving the project.

It occures not frequently, but It's not an accidential thing.
-I have exatly same symptom during at lease 4 years, even if it occurs rarely.
-I had same symptom with other system, workplace and home. The same thing on two system was both system used windows 10.

In every my experience,
-I duplacated clip on 'project pannel' which is placed left side of clip:timeline.
-I did not used guick button on the leftside, I duplicated clip with mouse right click on the clip > Duplacete Clip, manually.

It seems kind of.... when it occurs, tvp lost the 'current' window that tvp can change or interact (beeing inactive state or like lost current window?).
I think 'Duplicate Clip' fuction has postprocessing error( lost current clips or tvp main window is inactive or something) in some particular case, but I don't know what is the exact condition is.

it occured 11.7.0 just now and even on the previous version like 11.5.1.
As I remmember, I think it's exist form I started to use tvp11.

because I can not generate it again in intentional,
If there is anyone had same experience, I hope you to share it.

[ini]

I'm trying to find the condition that make freezing.

And here is one other ploblem.

If there is heavy clips or scene,
Processing 'duplicate scene' takes some time.
During that time, using 'esc' button will cause tvp crash down.