$message->getTextBody() returns content with headers

[igorkorneichuk]

After upgrading to 5.5 (previously used very old version), getTextBody() for some messages returns raw content with headers.

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Date: Tue, 28 Nov 2023 17:10:05 +0100
From: MA <***@***.de>
Reply-To: MA <***@***.de>
Message-ID: <352617112.20231128171005@***.de>
To: *** <***@****.com>
Subject: test
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

Hello

x

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