blue flashing glitch

Hello @alice_1288 thank you for reporting this. Can you please share some details with us for us to help understand the problem:

1. Beta build number

2. System details

3. Problem area - When is the blue flashing area seen? Is that for a particular file or scenario or everytime? It would be great if you could record a video and share and if it is happening with a particular file, then kindly share the file as well.