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UCC28720: Weird waveform at turn-off of the controller UCC28720

Part Number: UCC28720
Other Parts Discussed in Thread: UCC28710

I made a Flyback using UCC28710. It works well. I replaced the controller by UCC28720.

According to two datasheets, there is no many difference between two controllers such as maximum switching frequency. Then they must behave same.

However; at turn-off the waveform of VDS (VDrain-Source of MOSFET) is illustrated as above with the oscillation.

Is there anybody knows that phenomenon?