MAX() inside PIVOT yielding crazy results for value from window function

After switching from jar 1.0.0 to jar 1.1.3 I get wild values for a function that worked before, where I PIVOT using MAX() on the value from a window function:

Before the switch I saw correct values. When I use max(arg, n), I see the correct values again (but as a list):

first() also yields these crazy values. sum() works.