The Search window returns wrong types of assets when using t:prefab query

Reproduction steps:

1. Open the “LocTable” project
2. Press CTRL + K
3. In the Search window type “t:prefab”

Expected result: One prefab appeared in the search results
Actual result: One prefab and .fbx asset appeared in the search results

Reproducible with: 2021.3.11f1, 2022.1.19f1, 2022.2.0b10, 2023.1.0a13
Could not test with: 2020.3.40f1 (The Search window is not introduced)

Reproduced on: Windows 10

Note: issue also reproduces in the Project window with enabled Advanced search mode