I agree with you and whats funny is that in earlier versions of the richtextblock, the way to change it was by using span as well as img blocks. If you didn’t want to have different styles, you could change the default style within the appearance tab (so that render issue wasn’t even there). I am shocked to see them change how it worked so much between 4.20 and 4.19.
Also I found out that the RichTextBlockImageDecorator is bugged too. It says that “We recommend you subclass this as a blueprint to configure the instance.” in the documentation, however since the parent class (RichTextBlockDecorator) only contains BlueprintType and not Blueprintable in it’s UCLASS, these classes can’t be created as blueprints so the image decorators can’t even work.
Hopefully they fix this in 4.20.1, but since this stuff wasn’t in the changelog for 4.20, who knows. 