Deepsleep - wakeup reason is wrong

[bobo1974]

I put my esp32 in deepsleep after configuring the following wakeup sources:

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esp_sleep_enable_ext0_wakeup(GPIO_NUM_36, 0);
esp_sleep_enable_ext1_wakeup(GPIO_SEL_32, ESP_EXT1_WAKEUP_ANY_HIGH);
esp_sleep_enable_timer_wakeup(CHARGING_WAKEUP_INTERVAL);

When it wakes up I print the wakeup reason

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wakeup_reason = esp_sleep_get_wakeup_cause();
Serial.println("wakeup_reason");
Serial.println(wakeup_reason);

When the wakeup source is ext0: it works, the ESP32 leaves sleep. BUT the wakeup reason returned is -2- Timer.

Now when I comment out the timer source esp_sleep_enable_timer_wakeup(CHARGING_WAKEUP_INTERVAL), in this case I get the correct wakeup reason as EXT0.

Anyone has an idea why?
I'm only giving out extracts as they are part of a much larger program. I'm using Board manager 2.0.3