spacetime offset wormholes

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Imagine we had opened a wormhole to a distant planet, 50 light years away. 
From mapping the sky on both planets, we learn that we are visiting this planet
50 years in the future - or they are visiting an earth 50 years in the past.

This means: if we sent a signal at light speed to this planet by radio waves
through normal space, as well as simultaneously through the wormhole, then the
signals would arrive there at the same time.

Any signal they send us however, would be split: the wormhole signal could be
received immediately, but the intersolar signal would be received in 100 years.

You see that even though we see 50 years into their future, due to the nature
of spacetime it would be impossible to warn them of danger ahead: any signal we
could send them arrives too late.

Technically, they could alter the past throwing a bomb through the wormhole
and then immediately observe the effects in the sky. But none of this causes
a paradoxon or alternative timelines.