Split Bill and Tips Processing


Does anyone know how the split bill functionality works with the tips that are processed after the transaction is registered? I mean, let’s assume your paying $100 that you want to split by 4. The transaction is registered as $100 and then you give a 20% tip on the receipt. If you split the transaction by 4 it automatically sends 3 $25 requests. What happens when the transaction amended to $120 because of the tip? Does it send 3 $5 dollar requests automatically to the same list of people or it simply does nothing?