this issue still there in all VADP based backup tool. in my environment i have faced this issue .1) if you look in to these snapshots files, these files process always locked by VPXA worker. so if this is the situation, restart the vpxa agent and after that u can able to remove it. 2) log in to esxi and go to data store and check any .lck file ( hidden files ) , if it is there, then migrate vm to another machine and do manual consolidation and delete all the snapshots. once all the snapshots deleted. go back to your previous data store you can see remaining the .lck files as well snapshots files. delete the all the .lck files follow by delete the snapshots files.
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