Route planner freezing - App crashing without being able to save

Hello everyone.

As the title states I'm currently unable to plan my upcoming trek because the second part of it goes over what, for the Italian institutions, is a closed Via Ferrata. To be able and trace all the route correctly I have to manually trace over the previous Via Ferrata route (that is still on the map, i just cannot tell the app to use it with Walking/Hiking calculation) but when i do that i get over 100 shaping points and the app starts to go laggy, after a while it freezes and crashes.

I also tried to trace the route manually via Web-App but as a result I get that all the shaping points placed via web-app are at 0 altitude and invalidates my planning.

If it could be possible, in some way, to let the map calculate the route without need to manually tracing it?

If it can be useful, i leave here some useful insight regards the actual route.

I'm trying to connect the spring at N 44° 06.751', E 010° 12.036' to the "K2" bivouac at N 44° 07.256', E 010° 12.201' passing through "Ferrata del Monte Contrario".

My route is https://link.locusmap.app/t/dwvvdb