supervisor.RunReason is unexpectedly AUTO_RELOAD on newer beta-2 builds

[anecdata]

I may be doing something wrong or misinterpreting, but supervisor.RunReason isn't acting as I expect.

FeatherS2 with ESP32S2:

6.1.0-beta.2-124-gfd21ff59d on 2020-12-18

import time
import supervisor

time.sleep(5)
print(supervisor.runtime.run_reason)
supervisor.reload()

repeatedly gives

soft reboot

Auto-reload is on. Simply save files over USB to run them or enter REPL to disable.
code.py output:
supervisor.RunReason.AUTO_RELOAD

but expected supervisor.RunReason.SUPERVISOR_RELOAD

Also get AUTO_RELOAD by typing CTRL-D in the REPL (expected REPL_RELOAD)

Pressing the reset button on the Feather S2 gives

microcontroller.ResetReason.POWER_ON
supervisor.RunReason.AUTO_RELOAD

expected STARTUP

PyPortal:

seemed to work on older beta code:
6.1.0-beta.2 on 2020-12-03
adafruit-circuitpython-bundle-6.x-mpy-20201203

alarm.ResetReason.UNKNOWN
supervisor.RunReason.STARTUP

but now:
6.1.0-beta.2-124-gfd21ff59d on 2020-12-18
adafruit-circuitpython-bundle-6.x-mpy-20201220

microcontroller.ResetReason.UNKNOWN
supervisor.RunReason.AUTO_RELOAD