Unable to search in my apps list

Hi all,

I have a Ulefone Power Armor 18T with the Power_Armor_18T_AF1_V01 firmware. When I swipe up, I see, as expected, all installed apps and a search box on top.
However, when I try to use that search box to find an app, it doesn’t search/filter my apps. Instead, it sends my query out to regular Google.

Is this a known bug, or simply something misconfigured on my device?