"Solution not allowed"
Fragment of a discussion from User talk:Rua
You should never provide multiple forms as a single argument to a template. That's not just something for this particular template, but for all templates across Wiktionary. The right solution is to provide each form with its own parameter. If the Latin templates don't have a parameter to specify a second form, which appears to be the case, then that's a shortcoming in the template and you need to take it up with the author, User:JohnC5.