TYPO3 Core

When copying etc. a record via DataHandler and the record does cascading operations, which then fill the reference index updating stack, the stack gets processed at the end of the command. However, the reference index updating stack contains duplicate instructions to call reference index updating with the exact same table and uid multiple times.

A small check can be implemented where the reference index gets updated based on the collected stack; checking that the method does not get called twice with the same arguments.