Hi @TonghuiMing and @DavidMartinez - I am seeing this as well, but in a broader way.
I was noticing the List "Search" filter was case sensitive ("Exact match" box unticked) and did not return suggestions. I found this thread and disabled the filter I had set in the map on the layer, and after that my search was no longer case sensitive and offered suggestions.
With filter activated on layer in map:
(no suggestions)
(no results if lowercase, results if case sensitive match)
After removing the layer filter in my map:
Thank you