Cannot mj-include inside mj-attributes

[LorenzoLeonardini]

The following examples, in MJML produce the same result:

main.mjml:

<mj-head>
  <mj-attributes>
    <mj-include path="./test.mjml" />
  </mj-attributes>
</mj-head>

test.mjml:

<mj-button background-color="red" />

and

main.mjml:

<mj-head>
  <mj-include path="./test.mjml" />
</mj-head>

test.mjml:

<mj-attributes>
  <mj-button background-color="red" />
</mj-attributes>

However, in MRML, only the second scenario works, if the mj-include is placed inside mj-attributes the output does not have the included "styles"