[Bug]: "Search in folder" looses folder filter on search more

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

"Search in folder" shows not all available items

Steps to reproduce

1. Click to "Unified search"
2. Click in places > choose "in folder", select a folder from "all files" (e.g. with some jpg, more than 5)
3. Enter your search entry, e.g. "jpg"
4. Items will be found, click on "... Load more results"
5. More results will be loaded - but from everywhere - the search limitation to the folder is gone.
6. Click on "... Load more results" again
7. No more results will be shown at some point but the button remains.

Expected behavior

• search should stay restricted to the one folder
• 'Load more results' disappears at some point indicating all results are shown.

Nextcloud Server version

master, stable30

Web server

cloud.nextcloud.com, dev instance with latest master

Start by reproducing the issue in Unified search using a selected folder with more than five matching items, then use “Load more results.” Trace how the folder restriction and pagination behave across successive loads. Done means every loaded result remains within the selected folder and the Load more results control disappears when no results remain.