On my Android phone, some notes some times appear as black squares on the Notebook or All Note Cards list, instead of showing the usual preview. This seems to happen randomly. I have about 150 notes, and sometimes 2 or 3 appear as these black squares. Even after running a sync they will still appear as these black squares. However, when I open these notes the content does appear properly. The only way to fix this is editing or modifying the note, then after I close it the preview will appear properly again. Could this problem be checked, please? It's very annoying to search for a note and not being able to locate it because it does not show the preview.

Thank you!