SUMMARY
When dragging files between different tabs, Dolphin will not update the view from which a file was moved: Files will appear as if still there until you press F5 to refresh manually. Upon further investigation I discovered this only happens when dragging one or more files (not folders) between symlinked directories.

STEPS TO REPRODUCE
1. Create two directories, eg: ~/A and ~/B. Create a symlink pointing to each one, eg: ~/sym_A and ~/sym_B.
2. Open up Dolphin then press F3 to enable split view.
3. Navigate each view to one directory but through its symlink not the original path.
4. Place any file in either directory or just create an empty text file in one.
5. Shift-drag the file in between the different views to move it.

OBSERVED RESULT
While the moved file appears in its new location, it will not be removed from the old view and still appear as if a copy is present there. This goes away upon pressing F5 to refresh.

SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux 
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.106.0
Qt Version: 5.15.9
Kernel Version: 6.3.5-2-MANJARO (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 3700X 8-Core Processor
Memory: 31.3 GiB of RAM
Graphics Processor: AMD Radeon RX 570 Series

ADDITIONAL INFORMATION
I'm using Plasma Wayland session on Manjaro Linux, Dolphin 23.04.1, all partitions are ext4.