OpenStruct#respond_to? when true fails with NameError

Hello,

I have a case where I overrode respond_to? on a subclass of OpenStruct because I this class to work as fake object.

class Dep
  def a
    "Hello from Dep"
  end
end
class FakeDep < OpenStruct
  def respond_to?(*args)
    super || Dep.new.respond_to?(*args)
  end  
end

FakeDep.new(a: [])  #=> NameError: undefined method `a' for class `FakeDep'

      owner = method!(name).owner
              ^^^^^^^
from /usr/local/lib/ruby/3.1.0/ostruct.rb:245:in `method'

I didn't fully understand https://github.com/ruby/ruby/commit/f48edc28dda3df962f289fd373c06a8dfeda3dc0 and what happens with owner = method!(name).owner. Is the error above a valid case?

TIA

Reproduce the FakeDep example against the OpenStruct implementation at ostruct.rb around line 245, then read the linked commit to understand the method! and owner logic. Compare the observed NameError with the intended respond_to? behavior; done means establishing whether this is a supported bug and identifying the regression coverage or behavior change needed.