String parse into array bugged in Shipping build

In PIE(and stand alone):

string = “item_1”
delims = “item_”
result = [0]=“1” (correct)

In shipping:

string = “item_1”
delims = “item_”
result = [0]=“item_1” (incorrect)

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alternatively I tried:

In PIE(and stand alone):

string = “item_1”
delims = “_”
result = [0]=“item” [1]=“1” (correct)

In shipping:

string = “item_1”
delims = “_”
result = [0]=“item” [1]=“1” (correct)