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Following [47260] a namespace such as "test-ns" prevents any namespace such as "test-ns/v1" from being found when matching routes. While not best practice, this was an unintentional back-compat break; this patch restores the original behavior. Props david.binda, TimothyBlynJacobs. Fixes #48530. git-svn-id: https://develop.svn.wordpress.org/trunk@47351 602fd350-edb4-49c9-b593-d223f7449a82