circuitpython: espcamera IDFError with CP 9.0beta.0 -- works OK with CP 8.2.9

CircuitPython version

Adafruit CircuitPython 9.0.0-beta.0 on 2024-01-27; ESP32-S3-EYE with ESP32S3

Code/REPL

import board
import espcamera


cam = espcamera.Camera(
    data_pins=board.CAMERA_DATA,
    external_clock_pin=board.CAMERA_XCLK,
    pixel_clock_pin=board.CAMERA_PCLK,
    vsync_pin=board.CAMERA_VSYNC,
    href_pin=board.CAMERA_HREF,
    pixel_format=espcamera.PixelFormat.JPEG,
    frame_size=espcamera.FrameSize.SVGA,
    i2c=board.I2C(),
    external_clock_frequency=20_000_000,
    grab_mode=espcamera.GrabMode.WHEN_EMPTY)
cam.vflip = True

Behavior

Adafruit CircuitPython 9.0.0-beta.0 on 2024-01-27; ESP32-S3-EYE with ESP32S3

Auto-reload is on. Simply save files over USB to run them or enter REPL to disable.
code.py output:
Traceback (most recent call last):
  File "code.py", line 15, in <module>
espidf.IDFError: Operation or feature not supported

Code done running.

Press any key to enter the REPL. Use CTRL-D to reload.

Description

I am trying to run the AIO webcam example from https://learn.adafruit.com/capturing-camera-images-with-circuitpython/example-webcam-with-adafruit-io but I have stripped open the code to produce this error when trying to initialized the espcamera.

The code runs OK on CP 8.2.9 (both the full code and the stripped down test)

Line 15 is

grab_mode=espcamera.GrabMode.WHEN_EMPTY)

Additional information

No response