[2021] Collapsing ladders?

Particular places in particular POIs that are unsupported - that collapse as soon as SI is calculated - should be considered bugs in the game. They can be reported here:
https://community.7daystodie.com/bug-test-1/

There is a known issues doc maintained here:
https://docs.google.com/spreadsheets/d/1YNo1DLatARAXCyRWwLxOhrjKnZKLL-onr4hwc3IIUuI/edit#gid=0