Put dash character for VERSION_STRING_SEPARATOR in quotes. This should get it to be interpreted as a literal character instead of the start of a list.
Without quotes AutoPkg was throwing a "sequence entries are not allowed here" error:
WARNING: yaml error for /Users/autopkg/Library/AutoPkg/RecipeRepos/com.github.autopkg.MLBZ521-recipes/Jamf Pro Tools/Composer.pkg.recipe.yaml: sequence entries are not allowed here
in "/Users/autopkg/Library/AutoPkg/RecipeRepos/com.github.autopkg.MLBZ521-recipes/Jamf Pro Tools/Composer.pkg.recipe.yaml", line 13, column 29
Put dash character for VERSION_STRING_SEPARATOR in quotes. This should get it to be interpreted as a literal character instead of the start of a list.
Without quotes AutoPkg was throwing a "sequence entries are not allowed here" error: