I have been digging into 2021 and have encountered this issue as well. I have a follow-up question to this though. Is there a way to take our old devices (drawn in VW2019 and VW2020) and make their sockets and text conform to the new, auto-scaling of VW2021? We use a 1/8" snap grid for our projects so whenever we create new devices in 2021, the sockets are smaller and our custom device label has smaller text and is narrower. I do not mind the smaller text and I know that I can edit our custom labels to fit the width of the block, however, changing the the label symbol, changes all of the devices proportionately. Whenever I import our old devices from our Workgroup file, I choose to use the destinations symbols and everything, but they still come in exactly as they were drawn. I really don't want to have to lose our entire device library.
In the screenshot, the bottom device came out of our library and the top device is a new device from the Device Builder. They are both using the same custom label symbol.