Created attachment 161936 [details]
Highlighted blank field in menu.

SUMMARY
***
List of recently closed tabs shows blank boxes for tabs that were closed after a search is done in them.
***

STEPS TO REPRODUCE:
0. Optional: System settings > Appearance > Application Style > Configure icons & toolbars > Disable the 'In menus' option.
1. In Dolphin set it to show the Menubar so you see File, Edit, View Go etc.
2. Open a new tab.
3. Press the Search button.
4. Into the search field text box type in either a filename or nothing & press enter.
5. Close that tab.
6. Navigate to the Menubar: Go > Recently Closed Tabs > 
7. Notice that there are blank results boxes. If menu icons are disabled they appear as completely blank boxes, if menu icons aren't disabled they show as a magnifying glass to the left of the blank.
8. Click on the empty result box & it will reopen that search query results tab.

OBSERVED RESULT:
See #7 above.

EXPECTED RESULT:
Something other than a blank field; the directory the search is being done it (like any other closed tab shows), but with the magnifying glass next to it.

I was initially going to raise a wish-list bug suggesting for 'Reopen Closed Tab' to appear when right-clicking remaining tabs, as Firefox does, but then I found it in the Go menu, but encountered this bug - not sure if I should still raise that or not?

SOFTWARE/OS VERSIONS
Operating System: Debian GNU/Linux 12
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
Kernel Version: 6.1.0-11-amd64 (64-bit)
Graphics Platform: X11

Also tested on another machine with a quite fresh vanilla Debian 12 Wayland install & encountered the same result.