I have the same issue, I know they made a statement with this being an issue with certain controls due to the way the triggers respond. I dont remember what they exactly said but I believe it was due to having adaptive triggers and the input not being registered as a full input.
I am using an 8bitdo controller and my fix was using their software to recalibrate the controller and set my trigger response to zero. Since doing this I have not had any issues with grabs.
So depending on your controller, I would see if they have software you can use to update the response times. If not then my other solution before I figured out the fix above was just using a cheap controller and it worked fine.