I just completed my first journey into geocoding with ArcGIS Pro 2.5 and have noticed some odd behavior. The first odd thing I encountered is it would not let me edit the IN_singleline field with the re-match interface. I had to quit my Pro session and restart it, and then I was able to edit that field for rematching.
In this particular session, I'm only interested in 60ish (out of 4,000ish) unmatched addresses. The street they are along gets butchered in several typical ways, so I can select for them. I suspect the selection is the issue, but it's annoying none the less. See the gif below.