"search settings" does not show expected matches

[Ziusudra]

Description

When searching settings, strings that should match something, do not.

Steps to Reproduce

1. Open settings
2. Press Ctrl+f
3. type manage s - nothing displayed in results area
4. add an e to have manage se - now matches Manage search engines
5. delete added e - back to nothing displayed in results area
6. clear search, type search engine - nothing displayed in results area
7. add an s to have search engines - again matches Manage search engines
8. delete added s - back to nothing displayed in results area
9. clear search, type manage blah - No search results found displayed (as expected)

(Depending on how fast these are typed, some partial matches may be shown instead of nothing.)

Actual result:

manage s and search engine do not show any match, but manage se and search engines do.

Expected result:

All four strings should match the same thing.

Reproduces how often:

Easily reproduced

Brave version (brave://version info)

Brave 1.8.95 Chromium: 81.0.4044.138 (Official Build) unknown (64-bit)
Revision 8c6c7ba89cc9453625af54f11fd83179e23450fa-refs/branch-heads/4044@{#999}
OS Linux

Version/Channel Information:

• Can you reproduce this issue with the current release? Yes
• Can you reproduce this issue with the beta channel? have not tried
• Can you reproduce this issue with the dev channel? have not tried
• Can you reproduce this issue with the nightly channel? have not tried

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? N/A
• Does the issue resolve itself when disabling Brave Rewards? N/A
• Is the issue reproducible on the latest version of Chrome? N/A

Miscellaneous Information:

Arch Linux using i3 window manager, kernel - linux-lts x86_64 5.4.39
Let me know if there is any specific package dependency you'd like details on.

Another possibly related thing noticed while trying to figure out what was happening:

1. Open settings
2. Press Ctrl+f
3. type mab - No search results found displayed (as expected)
4. delete the b - No search results found still displayed with matches for ma displayed below.