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nrf52 DFU package with SD+BL+APPS fails to reconnect on iOS nrfToolbox after updating SD+BL

We're seeing an issue where a dfu package containing SD+BL+Apps gets stuck on iOS nrfToolbox during DFU process after it updated the first part 1/2, which is BL+SD. The same dfu package works on the Android nrfToolbox DFU, it's able to reconnect just fine to update the 2nd part, apps.

last part of iOS log after part 1/2: Application: Upload completed in 158.17 seconds Debug: [Callback] Central Manager did disconnect peripheral Info: Disconnected by the remote device Verbose: Scanning for the DFU Bootloader... <-- stuck here

I've confirmed that the target device did reboot back to DFU and advertises just fine. Again, on Android this usecase works just fine with the same dfu package containing SD+BL+Apps.

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