Studio not allowing me to add icon and thumbnails

I noticed a problem with the game settings for my game, I was tryna add an icon and thumbnails to the game and I got this error:

12:35:01.283 - Failed builtin_GameSettings.rbxm.GameSettings.Pages.BasicInfoPage.BasicInfo:257: Can't convert to JSON

So I removed all thumbnails and left the icon and I got this:

12:35:20.797 - Failed Can't convert to JSON

The icon and the thumbnails were all PNG

Does anyone know how and/or why this happened? Thank you very much

You can go to your game and click on the 3 dots in the corner and change it there. That happened to me too.

This happened with me also, but you can just use the site configure place.

You should create a new topic about this in #platform-feedback:studio-bugs and let Roblox staff fix it.
This will not get noticed by Roblox engineers here.

As previously mentioned, you can use the configure place feature on Roblox website as a workaround.