at 12:25 a group of sythe next to dead LLT wreck spontaneously decloak (north)
happens again at 16:47 in the middle, this time a pyro wreckage caused it
and again same spot at 17:08 panther wreck
dosent seem to be caused by bouncing units (sythe only bounced off the panther wreck)
on a side note:
at 7 minutes you can see a fighter tracking a cloaked sythe and attaking
(while sythe still cloaked)
this also happens with bombers, and is most noticeable with raipier, which will follow the cloaked unit, but not shoot, across whole map, once attack order was given