Note strip content in cross references panel varies
1. Indesign CC 2018
2. Open a document with cross refs.
3. When hovering with the mouse over a cross ref in the cross ref panel a note strip appears, showing some information about the page it points to and also the page of the source.
4. On some cross refs it does not. There it shows the cross ref text. This seems to be due to the cross ref format being slightly different, but all pointing to level 3 headlines.
5. See attached images adobe_error_5.1.jpg (correct note strip) and adobe_error_5.2.jpg (false note strip)