An interesting result from yesterday's firing; while cutting the circle for the blank, one white strip bisected accidentally. I didn't worry about it, since I was about to fuse it into a solid piece anyway. Even doing so, there are telltale signs:
Holding the piece itself you can see the crack is lighter in color, although the surface is smooth. It looks like the clear base fills in the gap instead of the white, and while there doesn't appear to be any weakness, it is visible.
The fourth blank had a similar issue, a small but not insignificant chunk popped off a white strip. The "heal" is noticeable, as before:
(Update, a few days later):
Another variation of this turned up when I made the plate, though you can see it in the last photo as well. Fusing is no replacement for good cutting and fitting!