Mining patch planer always do a error if selecting any of the belts from Ultimate Belts mod.
ERROR MESSAGE:

The mod Mining patch planner (1.2.4) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event mining-patch-planner::on_tick (ID 0)
mining-patch-planner/layouts/compact.lua:387: attempt to index field 'related_underground_belt' (a nil value)
stack traceback:
mining-patch-planner/layouts/compact.lua:387: in function '?'
mining-patch-planner/layouts/base.lua:61: in function 'tick'
mining-patch-planner/control.lua:27: in function <mining-patch-planner/control.lua:17>

Released an update that fixes the crash. It was because I didn't check if related_underground_belt property is properly defined. The other mod is missing these definitions but I already asked them to fix it.
Until they update the mod, the belts will be unavailable for layouts with underground belts.

ah nice ty