YAML: Headlines and links are not well formatted
As told in the documentation Basic HTML formatting can be used
for the description of an app. This formatting rule changed recently, as discussed in this merge request.
It now looks like that those apps which still use a YAML file to denote the description have not been updated when the formatting rule was changed. Therefore, links and headlines are not well formatted in the HTML rendering of the app web pages.
Here is an example: