View Formatting - JSON

I've been using JSON on SharePoint List to showcase information better. Here is how it starts:

{
"$schema": "https://developer.microsoft.com/json-schema/sp/view-formatting.schema.json",
"hideSelection": true,
"hideColumnHeader": true,

I have been using this for a while and I have had no issues. Ever since SharePoint lets you "switch to Design Mode" on Format View, the "hideColumnHeader" has not been working.

Has anyone been able to fix this?

FYI- while I edit the list, it will work but once i put the list into a SharePoint page, it will still show the column headers (BIG NO NO). It used to not show it. Also, my code is not wrong, It is now a template i use for multiple lists with no issues until recently!