I noticed that NVDA is unable to report background and highlighting color changes in Microsoft Word. Check the attachment for an example.

Steps to reproduce

1. Type a two lines of text in an empty document
2. Select the second line of text
3. Press alt+h,i and select a highlighting color
4. Select again, press alt+h,h and select a differenc background color
5. Arrow up and down in the document with color reporting enabled

Actual result: NVDA reports no difference
Proposed result: NVDA reports both background and highlighting color changes