MSP430FR5969: BSL: Mass Erase Always NAKs

Tool/software:

Hello,

When I send the mass erase command (0x15), it always NAKs (0xFF). Is this expected? It is hard to tell from SLAU319AF.

The mass erase does occur, so my question is strictly regarding the validity of the NAK response.

For reference, here is a working example with different commands (RX_PASSWORD, TX_BSL_VERSION).

Thank you,

Mike