Hi Paul,
Greeting from Syncfusion support!
We have reviewed your query and prepared a simple sample based on your requirements. However, we were unable to replicate the issue on our end. Please take a look at the sample we've prepared. In this sample, the submit function fires correctly, and validation is also performed.
You can review the sample here: https://blazorplayground.syncfusion.com/LDBUMDrqpzauhrVw
If you continue to face any issues, please consider modifying the provided sample to match your specific requirements.
Regards,
Kokila Poovendran.