Got the dutchman planed down, and filled the seams with sawdust and glue. It was on the inside corner and would mostly be covered by the tenon shoulders. I patted myself on the back for salvaging a bad situation with a reasonably discrete fix:
To avoid this sort of mistake again, I carefully marked all my remaining mortises on both sides of the cut and shaded them in:
Now I was moving. My mortises were going in a lot cleaner and faster. I had confidence with each swing of the hammer. Things were looking good, and I put my previous mistake well behind me. Until it turned out I had marked and then cut a perfect mortise on the wrong side of the board this time. Sigh. Cut another dutchman.
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