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As far as I understood, tf does not take into account any namespaces. Instead, every node that uses tf will accept a tf_prefix rosparam which will act similar to namespace in tf tree (this is done somehow by magic!). However, if you explicitly put a slash in front of a frame_id in any tf function, the tf_prefix will be ignored.
When using view_frame or tf_echo both /ens1/map and ens1/map are the same (no tf_prefix), however if a tf_prefix is set, the second one will become prefix/ens1/map while the first one will be the same.
I am not completely sure, but I think robot-specific frames should never be referenced in your code with a forward slash prefix.
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