M5Capsule: Speaker works with ESP-IDF v5.4.2 but not with ESP-IDF v5.5.1

[sylque]

This is my code:

#include <M5Capsule.h>

void setup() {
  auto cfg = M5.config();
  M5Capsule.begin(cfg);
}

void loop() {
  M5Capsule.update();
  if (M5Capsule.BtnA.wasPressed()) {
    printf("Button Pushed!\n");
    M5Capsule.Speaker.tone(4000, 20);
  }
  delay(100);
}

This is my platformio.ini file:

[platformio]
default_envs = capsule

[env:capsule]
;platform = https://github.com/pioarduino/platform-espressif32/releases/download/55.03.31/platform-espressif32.zip SPEAKER DOESN'T WORK!
platform = https://github.com/pioarduino/platform-espressif32/releases/download/54.03.21-2/platform-espressif32.zip
board = m5stack-stamps3
framework = arduino
monitor_speed = 115200
board_build.partitions = huge_app.csv
monitor_filters = esp32_exception_decoder
build_unflags = -Werror=all
build_flags = 
  -DARDUINO_USB_CDC_ON_BOOT=1 ; Enable Serial. See https://community.platformio.org/t/m5dial-no-serial-output-m5stamp-s3-board/37801/3
  -Wno-vla
lib_deps = M5Capsule M5Unified
build_type = debug

The sound is played back correctly with ESP-IDF v5.4.2:

platform = https://github.com/pioarduino/platform-espressif32/releases/download/54.03.21-2/platform-espressif32.zip

but I hear nothing with ESP-IDF v5.5.1:

platform = https://github.com/pioarduino/platform-espressif32/releases/download/55.03.31/platform-espressif32.zip