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LAUNCHXL-CC1310: Cannot get 2.4kbps modulation to work

Part Number: LAUNCHXL-CC1310
Other Parts Discussed in Thread: CC1310, , CC1101
I’m having trouble getting the CC1310 to operate in packet mode at 2.4kbps.
If I take two Launchxl-cc1310 eval boards, and program one with your reference rfEchoTx and one with rfEchoRx, they behave as expected.
By default, these apps are set to operate at 868MHz.  If I use SmartRF Studio 7 to generate SmartRF_setting.c files for 915MHz packet rx and tx, and use these files in the aforementioned rfEchoTx and rfEchoRx apps, that also works well.
BUT… if instead I use SmartRF Studio 7 to generate files for 2.4kbps 2-GFSK, 5.1kHz deviation (one of the presets in SmartRF Studio), and override the frequency to be 915MHz, and set the sync word (since this seems to get set to zero in this mode for some reason), it no longer works.
 If I set a breakpoint on receipt of any RX packet in the rfEchoRx app, it never triggers.  Is there something additional I have to do to make this lower modulation rate work?
I believe 2.5kbps SimpleLink Long Range (another preset) also does not work, although I haven’t gone back to double-check this.
Another datapoint:
If I take the two Launchxl-cc1310 boards and run SmartRF Studio 7 on both of them, then the 2.4kbps packet mode works.