Thank you for your feedback.
Indeed, all behaviors that you have pointed out could be observed in our demo for Batch editing and I may confirm that the missing image for the delete button is a bug, but as for the validation issue, this is a standard behavior of the validator controls, so I am not able to pinpoint it as a bug.
For bringing the button's image issue to our attention you will find your Telerik Points updated.
Finally, for your convenience I have created an item in our Ideas & Feedback Portal, where you could follow its progress:
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