params are not loading when defined both in desc block and separate params block

Desc block params are not loading when defined with separate params block, e.g.

desc "Create a User.", {
        headers: {'XAuthToken': {required: true}},
        params: Entities::UserEntity.documentation
}
params do
        optional :extra_parameter, type: String
end

In above case only extra_parameter and header field are visible. This worked well previously by showing all desc block params field with separate params block field.

This code works well by displaying header field with optional extra_parameter

desc "Create a User.", {
        headers: {'XAuthToken': {required: true}},
}
params do
        optional :extra_parameter, type: String
end

but below code only shows params field and not header field (I have removed extra param block)

desc "Create a User.", {
        headers: {'XAuthToken': {required: true}},
        params: Entities::UserEntity.documentation
}

I think this is a bug. What you guys think.

No source file or test is named. Reproduce the issue with the two desc and params block examples, then trace how desc params and params-block fields are combined in the generated API documentation. Done means the combined case shows both the header and extra_parameter, while each isolated case retains its documented fields.