Describe your concern

<select> maps to role=combobox in HTML-AAM
<option> maps to role=option in HTML-AAM

But combobox is not listed as an allowed parent of role="option" - this seems inconsistent.

axe currently will flag

<select>
  <option role=option>...</option>
</select>

as an error - but not

<select>
  <option>...</option>
</select>

despite them being functionally the same.

Link to the version of the specification or documentation you were looking at at.

Link to documentation:
https://w3c.github.io/aria/

Does the issue exists in the editors draft (the editors draft is the most recent draft of the specification)?
yes