Search mismatch: highlights found, results say ‘No matches’

• I have searched open and closed issues for duplicates
• I am submitting a bug report for existing functionality that does not work as intended
• This isn't a feature request or a discussion topic

Bug description

In the built-in search, the entered keyword is highlighted in the content, but the results panel shows "No matches". The previous/next navigation arrows remain disabled and cannot jump between matches.

Steps to reproduce

• Open any chat, click the profile photo, and click "search".
• Enter a keyword in the search box (e.g., "foo").
• Observe the keyword being highlighted in the content.
• Check the results panel and try using the navigation arrows.

Actual result:

• Keyword is highlighted in the content, yet the results panel displays "No matches".
• Navigation arrows (previous/next) are disabled.

Expected result:

• The results panel lists at least one match, and the navigation arrows allow moving between matches.

Screenshots

Device info

Tested on two devices (one with a beta OS); both produced the same result.
Device: iPhone 15 Pro / iPhone 14
iOS version: iOS 26 beta 8 / iOS 18.6
Signal version: 7.74

Link to debug log

Start by reproducing the issue through the built-in search flow: open a chat, open its profile, choose search, and enter a keyword on the reported iOS versions. Trace how highlighted content is connected to the results panel and navigation arrows; it is done when matches are listed and previous/next navigation works.