TYPO3 Core

@<trans-unit id="no_results" resname="no_results">

label in ext:lowlevel

typo3/sysext/lowlevel/Resources/Private/Templates/CustomSearch.html

<f:else if="{sword} !== ''">
            <f:be.infobox message="{f:translate(key:'LLL:EXT:lowlevel/Resources/Private/Language/locallang.xlf:no_results', arguments: {0: sword})}" />
        </f:else>

[UPDATE]

I suspect that the callout is the same that appears when selecting "Raw search in all fields" and performing a search that brings no results.

Markus Klein wrote in #note-2:

typo3/sysext/lowlevel/Resources/Private/Templates/CustomSearch.html

[...]

I guess it should be something like:
typo3/sysext/lowlevel/Resources/Private/Templates/CustomSearch.html

<f:else if="{sword} !== '' && {searchMode} != 'query'">
            <f:be.infobox message="{f:translate(key:'LLL:EXT:lowlevel/Resources/Private/Language/locallang.xlf:no_results', arguments: {0: sword})}" />
        </f:else>

Patch set 2 for branch main of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/81752

Patch set 3 for branch main of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/81752

I confirm that this issue is already solved on latest main with https://review.typo3.org/c/Packages/TYPO3.CMS/+/81764