Keys, I go to thinking about this and once again I strongly urge you to switch from sparse image files to APFS volumes. I cannot guarantee it will eliminate this problem, but it will eliminate at least a few under-the-hood processing steps, and you would gain additional speed, reliability and stability.
"All you've got to do is own up to your ignorance honestly, and you'll find people who are eager to fill your head with information" --Walt Disney
