I'm using this blueprint in my high-mining-productivity megabase to get three belts of ore out of each row of miners: https://factoriobin.com/post/Q5T3HcCJ Until recently, it has worked great (with the caveat that the direction arrows in the UI don't line up with the direction of the belts). But as of updating to Factorio 1.1.107 and mining patch planner 1.6.6, using this blueprint no longer places the express underground belts. It places the drills, modules, and power poles fine.

Image: https://drive.google.com/file/d/1AxoN4_ApMPDnf4ADfW8Nj8uvO2cblfaf/view?usp=drive_link

I recreated the blueprint from a copy-paste and it's now working. I'm not sure why it broke in the first place.

I also oriented the belts in the blueprint right-to-left and that has caused their direction to match up with the directional arrows in the planner.

This is the version that started working:

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

Thanks for the report, released an update that fixes the missing belt placement.