LibreOffice Calc with slow opening, why?

I’m using LibreOffice version 7.3.2.2 in Ubuntu MATE 22.04.
I noticed that after I open the 1st file (.ods, .xls, .xlsx) with LibreOffice Calc, subsequent file opening in LibreOffice Calc always come with a “Opening <file_name>” message in the taskbar. Although the file is already opened, but the “Opening <file_name>” message stays in the taskbar for >10 seconds.
Note that the “Opening <file_name>” message appear when I open the 1st file, but the message disappear relatively quickly as compared to 2nd or 3rd file opening.

Question 1, why the “Opening <file_name>” message stays in the taskbar even after the file is already open? Is there a way to make it disappear quickly?
Question 2, is it safe for me to start edit the file while the “Opening <file_name>” message still appear at the taskbar ?

I tried to repeat the same steps in Ubuntu 22.04 with GNOME42. There is no “Opening <file_name>” message pop out in the taskbar. Same as Ubuntu 22.04 installed with KDE plasma, no such “Opening <file_name>” message pop out in taskbar.
Not sure whether this issue is unique to GNOME2 desktop in Ubuntu MATE 22.04.

Hello,
This is also true in Ubuntu 20.04 (possibly earlier also).
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Have seen no problem editing while that message is visible or even closing the original file before the message completes.
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If you want a second copy open, from the menu Window->New Window.
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Did not (quick look) see open Bug report on this. You can look & file one if wanted here > Bugzilla

Thanks for the feedback.
Per your suggestion, I filed a bug report on this issue.
https://bugs.documentfoundation.org/show_bug.cgi?id=148788