Weird HPC mechanics

[Not-A-Normal-Robot]

I can't describe it in words, so here's a video:
https://user-images.githubusercontent.com/76723917/146645550-b1a7d9ab-335c-49e1-bef8-7f275df4d7ec.mp4

Notice how in the first setup, HPC is not recognized, however, in the second setup, HPC is recognized.

[MrZ626]

What does HPC really mean?
Should air garbage be treated as a garbage line or, just nothing?

[shoucandanghehe]

I think this issue can be convert to discussion