Autosave Bloat

I ran a backup of my drive array yesterday and saw a ton of folders with a long ID and “Masks.”  In this multicam project I have about a 15 minute segment for one camera that required a tracked mask (which worked very well, though it took forever to plot). Anyway, after 3 days of editing I now have 22GB of Auto Save files with Masks. Each folder is 651MB. (However the Masks folder in the project root folder is over 900MB. What’s up with that?)

This is the first time I’ve seen a Masks folder, I guess this is part of the new masking scheme. Aside from slowing the frequency of updates, is there any way to cut down on mask bloat?

 
System info
    Application: Premiere Pro (Beta) v26.3.0.53
    OS: Windows v10.0.26200, RAM: 63.79 GB GB, CPUs (logical): 16