I've just upgraded my otrs6beta5 install to the latest RC1 that was just recently released.
Now, all my html tickets are shown as plain text. Previously, when zoomed in on a ticket, the html email was loaded inside an iframe on the article list. Now there's no iframe and the email is converted to text and inside a regular <div>.
I don't see anything that hints to what could have caused this on the changelog.
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