Brave Browser - Not letting me open Dropdown Menu / Flashes Open only for a Second

Description of the issue:

Native HTML <select> dropdown menus on web pages won’t stay open. As soon as I click a dropdown to pick an option, the list pops up for about a second and then closes on its own before I can select anything. Makes any form with a dropdown basically unusable — I can’t change the selected value.

Steps to Reproduce (additional info):

  1. Open any page with a standard HTML <select> dropdown (e.g. a country picker on a sign-up form, or a test page like https://www.w3schools.com/tags/tryit.asp?filename=tryhtml_select).

  2. Click the dropdown to open the option list.

Actual Result (gifs and screenshots are welcome!):

The option list opens, stays visible for roughly one second, then closes by itself. No option gets selected. Happens on every site and every dropdown.

Expected result:

The dropdown list should stay open until I either pick an option or click away from it.

Reproduces how often:

Every time 100%, on all sites.

Brave Version (about:brave):

brave.1.90.122 64-Bit
Chromium 148.0.7778.167

Reproducible on current live release (yes/no):

Yes

Additional Information:

  • OS: Windows 11 Home Single Language, build 10.0.26200.

  • Only native <select> dropdowns are affected

  • Tried before reporting:

    • Private window

    • Disabled extensions one by one

    • Tested with Brave Shields down on the page

    • Tested with hardware acceleration toggled in brave://settings/system

  1. Does this occur on other browsers (Chrome)?
  2. Does this occur on Brave Beta/Nightly?
  3. Does this occur on a fresh Brave profile?
  4. Do you have any applications or mods that could affect this?