How many consecutive times have you used the MityVac? Did you buy the vehicle new?
I'm many-more questions, cuz' I find it really odd that not a drop came out of the oil pan drain plug hole. Had that been my ride, I would have gently swirled a really think screwdriver-end around the oil's hole exit.
I say this because because constant users of tube extractors can create a buildup of gunk at the bottom of their oil pans, over a matter of years, with engines designed not to remain gunk-free inside. Some engines need the oil pans removed to remove a buildup of metallic shreds, attached to the gunk.
I use a similar extractor (Pela). But I use it every-other oil change. I only crawl under my vehicles when I need to change the oil filter....
which is every other OCI. I do 3-3.5k OCIS. So since I'm already under the vehicle to change the filter, I may-as-well bring my oil drain plug wrench and bucket with me.
So that's why I raised my flag when you mentioned not a drop of oil exited the hole. That got me thinking that a gunk blockade might exist in your oil pan and I needed to respond to your post.
I have tested my Pela extractor on both the Kia and Hyundai and both will shed a couple ounces when I pull the drain plug, immediately following an oil extraction from atop.