If my mind were to wander to a question it would be, Is that the only one that broke through?
Basically you got a part out that could create havoc if it were to get into a timing chain. Apparently it did not and with luck it was the only one in there.
If the engine develops an oil leak up front from one of the bolts you will know which it was.
Should this leak be bothersome, pull the bolt clean things up and apply a sealant, locktight blue would be plenty good to seal the threads and any cracks in the housing.

Cheers, Charlie
If It ain't broke, Modify it!
87 Montero turbo Converted back in Spring1989
95 Montero SR 3.8 DOHC Only one?
93 Pajero 3 door 6G75 Mivec with paddle shifted 5 speed
Then a Gen2 SR with full coil independent suspension.