Bedrock 26.41 – “Block” error when One Block! by Dodo Studios is activated in a Realm on Switch 2

I am playing Minecraft Bedrock Edition v26.41 on Nintendo Switch 2.

I own a Minecraft Realm containing the Marketplace map/add-on “One Block!” by Dodo Studios.

When the Realm is hosted online, my Nintendo Switch 2 disconnects with the error “A problem occurred – Block” when the One Block is broken.

This also happens when another player breaks the One Block while I am connected to the Realm: I do not touch the block, but my Switch 2 disconnects with the same “Block” error when the other player breaks it.

The same Realm works correctly on PlayStation 5 using the same Microsoft account. The One Block can be broken normally there.

The same world also works correctly as a local world on my Nintendo Switch 2. I downloaded the Realm world and tested the local copy: the One Block works normally.

Other blocks and normal gameplay work correctly on the Nintendo Switch 2 while connected to the Realm.

I have already cleared the download cache and Marketplace cache and followed the troubleshooting steps recommended by Minecraft Help.

The Realm and PlayStation 5 are also running Bedrock v26.41.

The local copy has the One Block! behavior pack and resource pack active, and it works correctly.

Expected result: The One Block should work normally in the Realm on Nintendo Switch 2.

Actual result: Nintendo Switch 2 disconnects with “A problem occurred – Block” when the One Block is broken, even when another player breaks it.