Would being in the crack of time or Time Nest prevent you getting "copied" when a new timeline is made?

[TobyS]

Would being in the crack of time or Time Nest prevent you getting "copied" when a new timeline is made?

For example when Trunks travels back in time we have two timelines, one with future Trunks and one with baby trunks.

Lets say you went into a the crack of time or time nest.

While you are gone your buddy splits the timeline into timeline 1, and a new timeline 2.

You then leave the time nest and go back to your present.

Would you only appear back in timeline one, or would a copy of you appear in both timeline 1 and 2?

In my headcanon this is why there aren't multiple Towas and Miras running around, but there are multiple Dabras.
Does my headcanon hold, if there's no evidence either way, what do you reckon?