I have created a form wherien I am using asp-validation-summary tag helper to show errors. In my post request, I add an error using ModelState.AddModelError("","My Error") and return the View.

If the summary tag helper is used as asp-validation-summary="All", the html tag is rendered as

<div class="validation-summary-errors" data-valmsg-summary="true"></div> 

whereas if I use asp-validation-summary="ModelOnly" the html tag is rendered as

<div class="validation-summary-errors"></div> 

without the data-valmsg-summary=true property.

Am I missing something here?Here are the specs for the environment https://pastebin.com/pnm5Gak5

Is the tag helper behaviour dependent on the SDK (used 2.1.401) and must resolve if I use a different SDK?