Repro:

create trivial AndroidManifest.xml file in a path ending with "/layout/AndroidManifest.xml"
Have Lint check the file, e.g., using --project project.xml, with project.xml containing a line <manifest file="path/to/layout/AndroidManifest.xml"/>

Result: seemingly spurious errors like this:

path/to/layout/AndroidManifest.xml:2: Error: The required layout_width and layout_height attributes are missing [RequiredSize]
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 ~~~~~~~~
path/to/layout/AndroidManifest.xml:4: Error: The required layout_width and layout_height attributes are missing [RequiredSize]
  <uses-sdk android:minSdkVersion="15" android:targetSdkVersion="29"/>
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
path/to/layout/AndroidManifest.xml:5: Error: The required layout_width and layout_height attributes are missing [RequiredSize]
  <application>
   ~~~~~~~~~~~

Presumably, RequiredSize should not flag manifests, e.g., by only applying to XML files marked as resources (e.g., using the <resource> tag when using --project), or at least by ignoring manifest files (whether or not they're called AndroidManifest.xml.