Dear Radzen,
The problem with DropDown on Android. It manifests itself in different browsers (Chrome, FireFox, Samsung Internet). Therefore, I think that it may be related to the Samsung system keyboard.
When you expand the list with AllowFiltered , the keyboard momentarily opens with the list and keyboard immediately closing. Therefore, it is not possible to select an item from the list in any way.
For example:
Bug in latest version 3.10.2. There are no problems in the previous ones.
Android 11. Latest versions of browsers.
On ios 15 no have problem.