SUMMARY
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Copying large number of folders (1000+) (to two different HDDs) with many subfolders, when info bar finished of process of movingfolders, its like that some operation occurs but dolphin looks like freezed - you cannot do any operation - only after some minutes (2-3m in my system).

So what such operation is? Cleaning inodes? Tidy up folder information? 
Why info bar of moving folders dont report it? 

STEPS TO REPRODUCE
1. move from HDD sda to HDD sdb large number of folders with subfolders eg. 10000+
2. Wait to show the infobar of movement that process is finished
3. Try to eg. create a new folder... u cant, u must wait 2-3m (depend on the machine power) until some "hidden" operation by dolphin is finished without reporting it to user which may feels distressed. 

OBSERVED RESULT

dolphin is like freezed after info bar report finish move of folders

EXPECTED RESULT
to report hidden operation in order user to know what is happening 

SOFTWARE/OS VERSIONS
Linux/KDE Plasma:  KDE with bullseye 11
KDE Frameworks 5.80.0
Qt 5.15.2 (built against 5.15.2)
The xcb windowing system

ADDITIONAL INFORMATION