Published sheet not showing filters when embedded in a website using iFrame

I have a sheet that I have filters set up to display various tasks in the Cardview. When I publish the sheet and use the Embed Code, everything works as expected with the exception of the Filters. The filter button shows but none of the saved filters are available.

If I try and create a filter while editing on the website that the sheet is displayed in, it allows me to create one and only one filter and does not allow me to save it or name it. It also will not allow me to create a second filter.

Is this by design or is there a setting I'm not aware of? If it's by design, why, and is there a plan to address this? Any help in fixing this would be appreciated.

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