The documentation for the become plugin, ns.col2.extra, was malformed.
The errors were:
13 validation errors for PluginDocSchema
doc -> deprecated -> extra
Extra inputs are not permitted (type=extra_forbidden)
doc -> options -> become_user -> env -> 0 -> extra
Extra inputs are not permitted (type=extra_forbidden)
doc -> options -> become_user -> env -> 1 -> deprecated -> extra
Extra inputs are not permitted (type=extra_forbidden)
doc -> options -> become_user -> ini -> 0 -> extra
Extra inputs are not permitted (type=extra_forbidden)
doc -> options -> become_user -> ini -> 1 -> deprecated -> extra
Extra inputs are not permitted (type=extra_forbidden)
doc -> options -> become_user -> vars -> 0 -> extra
Extra inputs are not permitted (type=extra_forbidden)
doc -> options -> become_user -> vars -> 1 -> deprecated -> extra
Extra inputs are not permitted (type=extra_forbidden)
doc -> options -> become_user -> keyword -> 0 -> deprecated -> removed_from_collection
Field required (type=missing)
doc -> options -> become_user -> keyword -> 0 -> deprecated -> extra
Extra inputs are not permitted (type=extra_forbidden)
doc -> options -> become_user -> keyword -> 0 -> extra
Extra inputs are not permitted (type=extra_forbidden)
doc -> options -> become_user -> deprecated -> extra
Extra inputs are not permitted (type=extra_forbidden)
doc -> options -> become_user -> extra
Extra inputs are not permitted (type=extra_forbidden)
doc -> extra
Extra inputs are not permitted (type=extra_forbidden)
File a bug with the ns.col2 collection in order to have it corrected.