'Instance Index' node's 'Loop Level' parameter counts from the wrong direction

[Keavon]

The Instance Index node has a Loop Level parameter that lets you access the outer scopes of multiple levels of nested iteration. This is akin to i, j, and k index variables commonly used in nested for loops in programming.

As a regression, it has become reversed. 0 is supposed to correspond to the innermost loop level, but it instead is counting from the outermost loop level. This needs to be changed back to how it was designed.