@Html.Partial in MVC Core shows a warning MVC1000

I noticed this new warning for calling the @Html.Partial in the NetCore 2.1.1 and the description was:

Warning MVC1000 Use of IHtmlHelper.Partial may result in application deadlocks. Consider using Tag Helper or IHtmlHelper.PartialAsync

Is there any real reason or serious/major issue that might happen if not considered using the Async methods?