SUMMARY
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STEPS TO REPRODUCE
1.  Open a folder with multiple files (jpg's, pdf's also have the same issue, doesn't matter)
2. click on the filename (which make the filename editable)
3. press the TAB key (which makes the next file in the list editable

OBSERVED RESULT
the preview is still the original file you selected

EXPECTED RESULT
the preview should change as you change from file to file when using the TAB key.
(for example in my usecase, I was renaming files based on the content of their first page, so going trough each file one by one using the preview would have been very convenient if it worked)

SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux
KDE Plasma Version: 5.24.2
KDE Frameworks Version: 5.91.0
Qt Version: 5.15.2
Kernel Version: 5.16.11-2-MANJARO (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 3700X 8-Core Processor
Memory: 31.3 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 1080/PCIe/SSE2

(NOTE: I am aware i'm running outdated software, there was a problem with upgrading that I haven't bothered fixing yet. But I believe this issue also still exists in the latest version of Dolphin

ADDITIONAL INFORMATION
See this screencast of the issue as it happens, easily reproducible (on my end at least): https://youtu.be/vkwWnQmrHIc