[Quick Search] Visual artifact like a comma appears in the search field when a search for menu items filter is applied

A visual artifact like a comma appears in the search field when a search for menu items(Alt+shift+M) filter is applied to the quick search window. A similar artifact also appears for contextual search (Alt+shift+C)

Steps to repro:
1. Create a new Project
2. Open a quick search window
3. Alt+shift+M (a search for menu items filter)
4. type anything in the search filed
5. Observe a visual artifact as a comma appears in the search field

Actual Result:
A visual artifact like a comma appears in the search field

Expected Result:
No visual artifact appears in the search field

Occurring in:
2021.1.0a7, 2021.1.0a1

Note: Quick searcher introduced in 2021.1 as a core package

Environment:
macOS 10.14 only