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LM25574 inverting operating frequency range

Other Parts Discussed in Thread: LM25574, LM5574

The datasheet for the LM25574 states that the operating frequency range extends up to 1 Mhz, potentially limited by constraints of input and output voltage.

When I use the Webench design tool for the LM25574, it offers that frequency range.  However, if I use Webench for an inverting buck-boost configuration of the LM25574, it offers a range that only extends to 500 kHz.  Is that correct?  Is there a limitation using that topology that is different from a simple buck topology?  Or is the 500 kHz limit erroneous (perhaps carried over from the LM5574)?