The bug
When you try to /summon a mob in a chunk that is currently not loaded, the command fails. This is a bug for two reasons:
Java Edition has no problem doing it
Summoning the mob in-place and then teleporting it to unloaded chunks works just fine
NOTE: this workaround is not acceptable as a permanent solution, because it requires you to summon the mob in a loaded area first, and there are no coordinates that are guaranteed to be loaded (including ticking areas). Additionally, selecting the mob cannot be made perfectly reliable, and teleport has undesirable side effects.
How to reproduce
/summon turtle 100000 5 0Expected result
Summoned new Turtle
Once teleporting there, you should see it
Actual result
Unable to summon object
Comments 3
Yeah block manipulation commands failing for unloaded areas is intended/ok
EDIT: although maybe you mean MCPE-154009
Thank you for your report!
After consideration, the issue is being closed as Working as Intended.
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If I'm not mistaken, a similar problem occurs with /fill. The /fill problem makes more sense, but I just thought I should bring it up just in case.