Can someone travel outside the U.S. on an immigrant visa? (While waiting for actual green card.)

When someone enters the U.S. on an immigrant visa, is (s)he allowed to travel abroad while the actual green card is being processed/produced?

Not sure if it's right or even relevant, but I read elsewhere that when individuals enter the U.S. on an immigrant visa for the 1st time, their passport gets an I-551 stamp which allows them to travel freely. Is that the case?

submitted by /u/xySurfer
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source https://www.reddit.com/r/immigration/comments/rf3y3r/can_someone_travel_outside_the_us_on_an_immigrant/

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