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Hi Matteo,Good day to you.We have prepared a sample based on your provided code snippet and we are not able to reproduce the reported issue. Form validation is working properly at every time when the Dialog is opened.In above sample, we have re-opened the Dialog after closing the Dialog when click the button.We would like to know the below information to reproduce your issue,1. Share more details to replicate your issue. If possible replicate your issue in above sample and update us.2. Mention how you are closing and reopening dialog.3. Provide more details about form submission issue.Could you please check the above sample and get back to us with the above requested information? Based on that we will check and provide you a better solution quickly.Regards,Vinoth Kumar S