Syncing worlds on minecraft works one way but not the other with 2 xboxes

Yes. My examples are both from Minecraft, as opposed to the xbox one edition. However, at least one of the Xboxes does have the xbox one edition installed too.

Please do make sure that both consoles are running "Minecraft", and not "Minecraft Xbox One Edition".

While "Minecraft" is able to load "Xbox One Edition" worlds, you can't save/import "Minecraft" worlds into the "Xbox One Edition".

Check the game tile before you play the game:

Minecraft Xbox One Edition has "Xbox One Edition" in the name itself, and shows the game Character "Steve" with a pickaxe and a dog leaving a forest with some critters following them.

The Xbox Minecraft without "Xbox One Edition" is only named "Minecraft" and shows the game characters standing on a hilltop with several animals and mobs around them.

So really make sure that you are using "Minecraft" on both console, and not "Minecraft Xbox One Edition" on your original Xbox One, and "Minecraft" on the Xbox One S.

Minecraft.

My son occasionally uses the Minecraft Xbox One Edition to play with a friend who never switched for some reason. Everything I have discussed is about Minecraft, and not Minecraft Xbox One Edition.

Hey there, are you using 'Minecraft' or 'Minecraft Xbox One Edition'?

Hello Magistrar,

We understand that you're experiencing an issue concerning the inability to load a created from your Xbox One S console, to an original Xbox One but the process works the other way around.

We understand that if you own Minecraft, and not Minecraft Xbox One Edition, that your version currently should be completely updated, but our suggestion here is to check if there could be any possible updates for the game on your Xbox One S or original
Xbox One console through the manage game option.

We do also suggest to provide this find within the Minecraft Forums in case this will need a developer stand point.

Try this and feel free to get back to us here.

Best wishes!