Li Fan was a bit puzzled, "The ship was blown up, the team was wiped out, why cover it up?"
Li Qian thought for a moment, "All 'gate' permissions are managed by the public security system and the relevant companies owning the assets. Though the security bureau has a mechanism for forced gate crossing, it depends on the level of alert.
No company or citizen would allow an entire fleet to pass through for just a cockroach from across light-years. Because you never know where the other side will appear after passing the 'gate'; what if it's a surprise attack on 'Earth 0'?
If this time some slipped through the cracks, or if the security bureau got hold of their logs, they have the full authority to significantly increase Earth's 49327's threat level. But since they've all disappeared, even Earth 0 likely knows they are probably all dead, the threat level will just accumulate, finally getting stuck on an 'unknown' determination.