I sympathise, I've also been through this getting-it-right phase with several bread machines now.
Your excellent pics show a classic result of a too wet dough.
The paddle could mix some of the flour/water mix but because it was so sloppy, and it couldn't pick up the rest of the flour into the dough (hence the dry flour bits on the cooked loaf)
If you think this will happen again, then lift the lid as it mixes. If you don't get a dough ball in 5-10mins then sprinkle in another 1 -2 tsp flour as the paddle goes around. You should see a pretty instant result as the dough should start to form into one large ball.
Even though you followed the recipe to the letter, it doesn't allow for some flours being a little damper than others (all flour contains some moisture).
I hope your next loaf is better!
