Twenty Nineteen: Font size issue in Cover Block

[kajalgohel]

In Twenty Nineteen Theme, when we add a Cover block on the editor side and add the overlay text after that change the font size of the text then the changes are not reflected in the backend as well as frontend side, and I think instead of changing the text size, this is changed the Image size.

Steps to replicate:
1: Activate the Twenty Nineteen Theme
2: Add Cover block
3: Add Image and Text
4: Change the Font Size of the text from the Typography settings
5: View the page/post at editor side
6: Save Page/Post
7: View the page/post at the front side

For better understanding, I provide a video attachment link.

Video link: ​https://share.cleanshot.com/BxwGn4Db3gCrbhlD3v8L

Thanks.