suspicious tag combination - waterway=canal together with tunnel=yes

[Volker Schmidt]

Hi
Everytime JOSM finds a canal in a tunnel in my edits it gives me this
warning. But according to the wiki
<https://wiki.openstreetmap.org/wiki/Key:tunnel>, this tag combination is
perfectly correct:
" tunnel=* is used for roads, railway line, canals etc that run in a tunnel
<https://en.wikipedia.org/wiki/en:Tunnel>."

Am I missing something?

Volker

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