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It seems the default for any SfButton is a 'Submit' type, you can test this by adding a SfButton to an Edit Form which has validation, then when you click it, it submits the form, at the moment the only way around this is to add HtmlAttributes and then set the type = "button", why not have a ButtonType property for the button so you can set it in the SfButton tags for example:
<SfButton Type="ButtonType.Submit">Save Details</SfButton>
<SfButton Type="ButtonType.Button" @onclick="OpenAnotherDialogInForm">Open Dialog</SfButton>
Yes I can use the workaround option for now.
Sometimes you don't want every button on a form to be a submit, just a thought.