I guess it’s the same behavior as RST double tap on Adafruit LoRa32u4
Manually bootloading
If you ever get in a ‘weird’ spot with the bootloader, or you have uploaded code that crashes and doesn’t auto-reboot into the bootloader, double-click the RST button to get back into the bootloader. The red [white] LED will pulse, so you know that its in bootloader mode. Do the reset button double-press right as the Arduino IDE says its attempting to upload the sketch, when you see the Yellow Arrow lit and the Uploading… text in the status bar.
https://learn.adafruit.com/adafruit-feather-32u4-radio-with-lora-radio-module/using-with-arduino-ide