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I've changed the forms to not use TempData and use HttpContextItems instead.
However after the form is posted, the cookie ".AspNetCore.Mvc.CookieTempDataProvider" is added and not deleted.

How can I fix?

Umbraco 13.6.0
Umbraco forms 13.4.0

I have set the forms options as:
    "Forms": {
      "Options": {
        "TrackRenderedFormsStorageMethod": "HttpContextItems",

If I cant remove the cookie, is there any way I can get a secure flag on it?