If I search “t: prefab blahblah”, do some things in the editor, then come back to the project search bar, it’s now “blahblah t: prefab”. I’m confused why this does this, it always throws me off since I just want to quickly search for another prefab by pressing backspace a few times on the object name.
Yes this is an old behavior which is done for the AssetDatabase.FindAssets API. You can try to use the new Search Window if you want (CTRL+K).