Non-default Spreading Factor not working

I have two other devices in the same room that are able to communicate while my LoRa Radio Bonnet on my Pi Zero cannot. The other devices can receive (FFFF0000345733E11203B22B47187E) what is sent but my Pi doesn't get anything that is sent.
One device is a Wio Terminal using the LoRa-E5 with these setting:
```
AT+TEST=RFCFG,915,SF12,125,12,15,14,ON,OFF,OFF
//AT+TEST=RFCFG,[F],[SF],[BW],[TXPR],[RXPR],[POW],[CRC],[IQ],[NET]
```

The other is a Feather nRF52840 with the FeatherWing RFM95W, which I assumed would be the easiest to communicate with being the same LoRa module. I am using this library https://github.com/sandeepmistry/arduino-LoRa since the RadioHead lib doesn't compile for the nRF52. It's settings:
```
long loraFreq=915E6;
if (!LoRa.begin( loraFreq)) { // initialize ratio at 915 MHz
while (true); // if failed, do nothing
}
LoRa.setTxPower(12);
LoRa.setSpreadingFactor(12);
LoRa.enableCrc();

```
And finally the settings from the Pi:
```
rfm9x = adafruit_rfm9x.RFM9x(spi, CS, RESET, 915.0)
rfm9x.signal_bandwidth = 125000
rfm9x.coding_rate = 6
rfm9x.tx_power = 12
rfm9x.spreading_factor = 12
rfm9x.enable_crc = False
#True didn't work either
```

Any help would be appreciated.

Start with the `adafruit_rfm9x.RFM9x` configuration shown in the issue and compare its bandwidth, coding rate, power, spreading factor, and CRC settings with the two working devices. Reproduce the interoperability failure, then establish which configuration change makes the Pi receive packets from the other radios.

Written by the indexing model from the issue text.