I'm making the joint for the leg shown in the following diagram, using handtools. There are two intersecting through-mortises. A tall one (for the apron running topleft-bottomright in the picture), and a square one (running topright-bottomleft).
I have (incorrectly) started my joint with the tall through mortise first. I should have used a sacrificial piece to occupy the first mortise hole while working on the second, but I didn't, and my chisel blow has broken out maybe a 1/4" chunk from the lower inner wall.
On the left, the overall view of the leg. On the right, inside view from right side (high-res here).
It didn't break off cleanly, so I removed the chips. On the picture on the right, I've drawn a rough polygonal outline of the breakout.
Can this hole be re-filled with something? Or should I just restart the leg? I considered making an epoxy or glue+dust fill, and re-chiselling around.