[chef] merge hash attribute in chef-client --local-mode

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Hello,

If i use chef-client --local-mode (11.14.2) with my recipe, where i have
default hash attribute like a = {"default": "1"} and try use a role with
override_attributes section where a = {"no-default": "2"} i get result a =
{"default": "1", "no-default": "2"}.

I know that if a determine a default attribute in role it will be merge, but i
think that if i write my attributes in "override_attributes" section that will
be overriding. What i do wrong?