What is the difference between RCTTypeBulletproof and RCTTypeBulletProof2?

Question

There seems to be two types of bulletproof transactions in monero, was there maybe a bug in the first one?

Answer 1

RCTTypeBulletproof2 adds some additional data (beyond the RCTTypeBulletproof type):

• It changes the field nbp to a varint field, which has the count of Bulletproof signatures [source]
• It adds the encrypted amount to each output [source]