After a few editing sessions on a route, ABRP fails to plan properly

I’m planning many separate legs of a 10,000-mile drive in my Tesla that has both NACS and CCS charging capability. It’s a very small battery that’s degraded over four years to about 52KWh capacity, which on level roads at 68 F with no wind gives me about 180 miles of range. Under adverse conditions that I expect to encounter (mountainous, 25 mph headwinds, 35 F temps), I’ll get as few as 100 miles of range. So it’s critically important for me to plan as accurately as possible to rule out effective dead-ends that can’t be reached.

The leg I’m working on starts at Amarillo, TX, and ends near Salt Lake City, UT, visiting many national parks in-between. I had a nominally-ok route planned, but after I made a small change to that route and re-planned, the system filed to route with a “No valid plan found - this is the best attempt” message. It failed to shows passable sections that are well within my car’s range, highlighting most of the route in dotted red lines.

Here’s the plan URL:

https://abetterrouteplanner.com/?plan_uuid=05a6d25f-3c7e-4e02-a8ce-769fb5e71a02

Here’s a screenshot:

I’ve tried restarting the plan, clearing it and reloading it from my saved plans, closing/restarting my browser (Firefox on MacOS), and logging out/in ABRP. No change after any of these actions. I’m stuck, and I need to depart (New Hampshire) in two days!