[Bug]: Weird black hyphen on the bookmarks toolbar

[rvsmooth]

Pre-Submission Checklist

• I have checked the existing/closed issues to ensure this issue has not already been reported.
• I am using the latest supported version of the browser.
• I have tried disabling all browser extensions/add-ons to rule out interference from these.
• I have tried clearing the browser cache and cookies.
• I have checked with a new profile and the issue still occurs.
• I have provided detailed step-by-step instructions on how to reproduce the issue.
• I have included relevant screenshots or console outputs.
• I have checked that this problem is not occurring in the latest version of Firefox ESR.
• This issue is specific to this browser and does not occur in other browsers.

Bug Summary

There appears a weird minuscule hyphen on the bookmarks toolbar when the address bar is highlighted/selected in the floorp fluerial ui.

Reproduction Steps

1. Open floorp
2. Click on the addressbar (must've enabled fluerial ui)

Expected Behavior

it should be clean ?

Actual Behavior

there appears a black hyphen

Screenshots

output.mp4

Browser Version

Mozilla Floorp 11.21.0

Operating System

Arch Linux

Additional Context

No response