UI with text box flickering when opening and closing

When opening a text box it flickers with or without resource pack.

Affected UI with text box. I've been playing minecraft for a years and this is the only version I encounter this issue.

 

Step to reproduce:

1. Open a UI with text box
2. Click the text box and close

Observed Results:

UI flickers/flickering when opening and closing the text box

Expected Results:

UI don't flickers

 

Phone: Huawei bll-l22

CPU: Kirin 655

RAM: 3GB

 

Can't upload more than 10MB video here

Video Link(Google Drive):

https://drive.google.com/file/d/183HncxHVnR1yYzbt7kRmx7ijzm3W8-i3/view?usp=sharing

 

Apologise to my recording, no idea why OBS do that.