[Bug]: Primary split button does not keep the primary color background when open

[avenezia]

Package

react

Package version

8.120.9

React version

16.14.0

Environment

Currently having issues running npx

Current Behavior

When opening the menu for a primary split button, the section which contains the chevron icon does not keep the primary background (e.g. green) and instead gets the Fluent UI default one being blue.

Expected Behavior

The color should not change when opening the button menu.

Reproduction

https://codepen.io/avenezia/pen/jOgmYJa

Steps to reproduce

1. Go to https://codepen.io/avenezia/pen/jOgmYJa and click on the primary split button
2. The section with the chevron icon gets the blue background instead of keeping the green one

Are you reporting an Accessibility issue?

None

Suggested severity

Urgent - No workaround and Products/sites are affected

Products/sites affected

Power Query

Are you willing to submit a PR to fix?

no

Validations

• [x] Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• [x] The provided reproduction is a minimal reproducible example of the bug.