<p>If I understand the code correctly the problem is simply with the logic  that if tags are changed we use the current members of the relation to determien the bounding box, but in this case that list is actually empty and we should be using the list of changed members, see <a href="https://github.com/openstreetmap/openstreetmap-website/blame/master/app/models/relation.rb#L387">https://github.com/openstreetmap/openstreetmap-website/blame/master/app/models/relation.rb#L387</a></p>

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