I diffed peripheral.c version 1.3.2 with version 1.4 of the same file.
I noticed that calls to GAP_UpdateAdvertisingData() were added for GAPRole_SetParameter(GAPROLE_ADVERT_DATA) and GAPRole_SetParameter(GAPROLE_SCAN_RSP_DATA).
This seems to be a rather important change, without which updated advertising data was not being transmitted.
I further notice that version 1.4 of peripheralBroadcaster.c does not contain the new GAP_UpdateAdvertisingData() calls.
Is this a bug or is something subtle going on?