Hi ,
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I confirmed using 'Is Null' operator in the FormComponentBehavior for a DateTime field has a bug. I have logged it, the bug id is 472314. We will fix it in the futue, you can use this bug id to track the status.
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Thank you very much for helping us to find this bug!
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For another two issues I will do more analysis on them later. Will let you know once I have a result.
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Thanks
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