Hello Carlos,
This is a bug in the client where we accidentally escape html entities twice. This is fixed and will be released with Mendix 5.18.
With love from R&D.
You can maybe inject content using JavaScript
Maybe something like:
$(".appendGt").html($(".appendGt").html()+">");
Just add that special .appendGt
class to your button and execute the above in an HTMLSnippet rendered as JS. Something like that anyways...
Thankyou