Question splitter issue

Nov 27, 2021
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I got an Amazon basic hdmi splitter.Common one but its name is in Chinese only. Anyway it works as a 2 to 1 and was advertised as a passive but it does have a micro usb power in and I find it wont work without power in..
So much for passive.But it works.Maybe you cant use more than a 1 ft hdmi cord...anyway...
Here is the issue..I used a USB C male to USB A female adaptor to power it from a thunderbolt port...(they give you a cord)...but it didn't work.. I checked the thunderbolt port and its good...new Mac M1...but the splitter does work when you use regular USB A port...why might it be that way???