Issue with @ extension='html'

I am facing issue with sightly href="${url @ extension='html'}" . html extension was removing all the empty query parameter (query param which dont have any value) from the url and keeping only those which has value.

e.g. original url -  endpoint.html?param1=&param2=val2

       corrected url after @ extension = endpoint.html?param2=val2

All of a sudden it has stopped removing those empty params. Any suggestions?