As described in https://it.wikivoyage.org/wiki/Utente:Andyrom75/Test2 the rendering of ":" (i.e. DL) is pushed out from the DIV where is located creating a lint error.
Since Template:Listing is one of the fundamental and most spread template in Wikivoyage, it produces thousands of lint errors along all the language versions.
Can this be fixed?
Inside the mentioned page, I've added a case that show where the parser has inserted the second row outside the LI tag creating a layout issue and the graphical fix will generate a lint error.
On en:voy they insert <BR /> tag to avoid lint error but complicating the wikicode.
Is this parser beaviour fixable?
It looks like https://it.wikivoyage.org/wiki/Modulo:Listing is doing a lot of work to escape newlines found in the "descrizione" because the template is typically used in a single line context, like a list item.
List items in wikitext are terminated by a newline. For example,
* A newline * in a list marks the end of the list.
from https://www.mediawiki.org/wiki/Help:Lists#A_little_bit_further
This behaviour shouldn't be specific to dl tags though.
For example, if you had,
* {{1x|first
second}}it's going to be expanded to,
* first second
and rendered as,
<ul><li>first</li></ul> <p>second </p>
There are proposals around for typed templates, like https://www.mediawiki.org/wiki/Parsing/Notes/Wikitext_2.0/Typed_Templates, that could help.