[Realms Pro] /structure load fails to spawn saved entities, while blocks load successfully

There appears to be a bug affecting Minecraft Bedrock Realms Pro where the /structure load command fails to spawn entities contained within saved structures, despite successfully loading blocks and displaying a success message.

This issue has been reproduced multiple times on a Realms Pro subscription running Bedrock 26.63.

Most importantly, the exact same world was tested on both a Realms Plus subscription and a Realms Pro subscription. The structures loaded correctly with entities on Realms Plus, but failed to spawn entities on Realms Pro.

The issue was also reproduced in a different world slot on the Pro Realm, suggesting it is not specific to the world.

Steps to Reproduce

1. Join a world hosted on a Realms Pro subscription.

2. Find an open area and summon a cow using:

   /summon cow ~1 ~ ~1

3. Save the area containing the cow using:

   /structure save mystructure:entitytest261 ~-3 ~-2 ~-3 ~3 ~3 ~3 true disk true

4. Move to another location away from the original cow.

5. Load the saved structure using:

   /structure load mystructure:entitytest261 ~ ~ ~ 0_degrees none true true

6. Observe the results.

Both saving and loading have entities explicitly enabled.

Expected Result

The saved structure should load successfully, including both its blocks and the cow contained within it.

Actual Result

The structure loads its blocks correctly, and Minecraft displays a success message indicating that the structure was loaded.

However, the cow does not spawn.

No error message is displayed, and the command appears to execute successfully despite failing to restore the entity.

Additional Testing and Findings

Several additional tests were performed to isolate the cause:

1. Realms Plus comparison: The exact same world was loaded on the original Realms Plus subscription, where structure loading worked correctly.

2. Realms Pro comparison: After transferring the world to Realms Pro, the structure commands failed to restore entities.

3. Different Pro Realm world slot: The same cow-saving and loading experiment was repeated in another world slot on the Pro Realm. The issue persisted.

4. Structure blocks: Structures containing entities can be loaded successfully using the structure block interface, whereas loading through /structure load does not spawn their entities.

5. Custom structures: The problem was initially discovered with custom boss structures stored in a behavior pack. However, the issue was reproduced using a newly summoned vanilla cow and a structure saved directly through Minecraft commands, demonstrating that the original custom structure files are not required to reproduce the failure.

6. Entity inclusion: Entity inclusion was explicitly enabled during both saving and loading. This did not resolve the issue.

Conclusion

These tests strongly suggest a bug specific to Realms Pro's handling of entities loaded through the /structure load command.

Since the exact same world works correctly on Realms Plus, and the problem also occurs in another world slot on Realms Pro, it does not appear to be caused solely by world corruption, the migration process, or the original custom structure files.

The command successfully loads blocks but silently fails to restore saved entities.

This affects command-based systems that rely on structure files to spawn entities, including custom bosses, encounters, and automated structures.

Please investigate differences in structure entity loading between Realms Plus and Realms Pro.