getBase64FromMediaMessage returns ephemeralMessage error with iOS audio messages

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Version: 2.4.0-rc2 (also tested on v2.3.7)

Description:
Calling POST /chat/getBase64FromMediaMessage/{instance} with an audioMessage
received from an iOS device returns a 400 error.

Error response:
{"status":400,"error":"Bad Request","response":{"message":["TypeError:
Cannot read properties of undefined (reading 'ephemeralMessage')"]}}

Message source: iOS (ptt: true, mimetype: audio/ogg; codecs=opus)

Steps to reproduce:

1. Send a voice message from an iPhone to a WhatsApp instance
2. Call POST /chat/getBase64FromMediaMessage/{instance} with the message object
3. Error is returned regardless of which fields are included in the body

Expected behavior: Return base64 encoded audio for transcription

Workaround: None found. Direct download of the URL returns encrypted .enc file.