MissingAttributeError when access optional field with hash syntax

[pricelessrabbit]

I all :) hope it is the right place to post.

Describe the bug

i tried to access struct attributes using the hash syntax and i found out different behaviour when access optional field in struct using method (struct.field) and hash (struct[:field]).
Is this the intended behaviour or a bug?

To Reproduce

class MyStuct < Dry::Struct
   transform_keys(&:to_sym)
   attribute? :my_attribute, Dry::Types::Integer.optional
end

Expected behavior

s = MyStruct.new
s.my_attribute # nil
s[:my_attribute] # nil

Actual behavior

s = MyStruct.new
s.my_attribute # nil
s[:my_attribute] #MissingAttributeError