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Loading a form within an IFrame on another form is not supported, please see https://docs.microsoft.com/en-us/dynamics365/customer-engagement/developer/use-iframe-and-web-resource-controls-on-a-form. Probably the behavior you are facing is due to this.
You should use a Quick View form for this task : docs.microsoft.com/.../create-edit-quick-view-forms
i am afraid not - this is the reason why it is not supported and documented as such
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