Function Display of the critical path

Attached four files. In the file named “Exercise” i can display the critical path, instead i can’t display the path in the other three files named “Example 0”, “Example 1”, “Example 2”. Why?

Example 1- TEST Critical Path.gan (12,3 KB)
Example 2- TEST Critical Path.gan (10,7 KB)
Example 0- TEST Critical Path.gan (14,7 KB)
Exercise.gan (3,3 KB)

In example 1 there is a milestone Gate 3 in year 2025 and it seems to be the only task with non-zero float. Removal of the milestones Gate 2 and Gate 3 makes critical path working as expected.