Shuffling often does not shuffle last index of array

Shuffle disproportionately does not shuffle last index in the array when using the "Shuffle Array" node.

[Not Reproduced Internally]

1. Download, Unzip, and Open attached project
2. Press PIE

Results:

In some cases, multiple clients will retain the last index in the same position at the same time. According to user's report, this happens more often than it should.

Expected:

Last index remains in last index during shuffle exceedingly rarely, and the likelihood that multiple clients produce the same last index should be much less likely.