Created attachment 173487 [details]
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SUMMARY
There is 2 methods of assigning the tag: through "Assign Tags" in Context menu and through Information Panel.
Information panel assigns tag with slash (/) like "/context" while "Assign Tags" does this without slash (/) like "context".
Here I stand for method without slash because it looks cleaner. Although it is a topic for discussion.

STEPS TO REPRODUCE
1. Open Dolphin
2. Select any file or folder which your user can edit
3. Open Information Panel through F11
4. Select file or folder
5. Reach "Tags" properties in Information Panel
6. In the field "Create new tag:" enter desired name for the tag like "context".
7. Click "Save".

OBSERVED RESULT
Tag itself is added with slash (/) in mind, you can observe it by holding mouse over tag name in "Tags" section or by activating Tags column.

EXPECTED RESULT
I wish Information Panel will add tag without slash.

SOFTWARE/OS VERSIONS
Operating System: EndeavourOS
KDE Plasma Version: 6.1.4
KDE Frameworks Version: 6.5.0
Qt Version: 6.7.2
Kernel Version: 6.10.7-arch1-1 (64-bit)
Graphics Platform: X11
Latest packages are installed.

ADDITIONAL INFORMATION
Vanilla Dolphin, vanilla Baloo, vanilla EndeavourOS.