Upgrade Mautic4 to Mautic5 changes emojis to text?

Your software
My Mautic version is: 5.1.1
My PHP version is: 8.2
My Database type and version is: MariaDB 10.5.26

Your problem
My problem is:

After Update from Mautic4 to Mautic5 Emoticons in E-Mail Bodies are shown as e.g. :registered: instead of ® …

Steps I have tried to fix the problem:
Looked up into database, its indeed saved as ®

Was there a different mechanism in Mautic 4?