Affected: 2.3 Beta 6 (Beta 5 was OK).
Looking into the style properties, you find under Messages->User->Message user info elements:
Template style_property_template_messageUserElements not found.
One has to revert the setting and checking on the desired elements again.
Importing the style...
In 2.2.x it is there. Anyway: swiping right (with thumb or two fingers) is a feasible solution - you only have to know about it. (At least on iOS 17.x)