I accidentally posted this twice. Sorry.

On the invisible mech challenge you can take out your teleport "scan" for the invisible mech because the teleport still say oh you can't go here !!?? it already
has a mech here it kind of ruins the invisible part of the game

maybe the teleport should not say if there is something there

Don't worry, I've deleted the extra.
And think of the invisible mech as a fun thing in the game, not as a real challenge, so don't mind it too much

Plus, shooting at it and being shot by it also reveals the mech, even if temporarily, so you can know where it is.