[Python] Why does request.get_json() return None for a valid JSON POST in Flask 3.0?

from flask import Flask, request, jsonify

app = Flask(__name__)

@app.post("/echo")
def echo():
data = request.get_json()
return jsonify(received=data), 200


Has the behavior of request.get_json() changed in Flask 3? Do I need to enable JSON parsing explicitly or is there a new recommended way to retrieve a request body?

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