The description of the "Subspace Bubble" advancement refers to a distance of 7km - however, Minecraft has no official definition of what a metre is, and for players unfamiliar with the metric system, a distance of "7km" might be confusing. Replacing "7km" with "7000 blocks" would be a good solution.
MC-280171
The "Subspace Bubble" advancement description is unclear
Resolved
Invalid
0
A meter is a block's length, this is not a bug but a change request.