Currently a branch name (e.g. test/v1.2.3) is split using the following code (main_helper_functions.ps1 - Parse-Version-From-ReleaseBranch):
While this code looks like it does the correct thing, there is actually no overload of .Split taking only a string as parameter. Instead this will convert the string into a char array because there is an overload using a char array.
This produces invalid results because the .Split method will return three entries (e.g. "test/v1.2.3" -> "test", "", "1.2.3"). This causes the method to throw an exception on a correct branch name, breaking functionality like New-Version.
Instead the split should be written to use the correct overload (string, StringSplitOptions):
Other useages of .Split in the build script work correctly because they either use the no-parameter overload or split based on a string with only one character, in which case the method behaves as excepted.