I have a bug, when I press in creative 1,2,3,4...9 - my items disappear. Plese fix this bug

Hey there!

I'm struggling to understand what the issue is here. If you don't mind, please could you provide some screenshots or videos showcasing what the problem is, whilst the F3 Debug screen is enabled. Thanks!

Please provide a video with the debug screen enabled (hit the F3 key) demonstrating the issue.