The API works as expected and has not been changed. As example see [0, 1, 2]. `parameters=` only works in connection with `askargs` where instead an `ask` request is defined by [3].
[0] https://semantic-mediawiki.org/w/api.php?action=askargs&conditions=Modification%20date::%2B&printouts=Modification%20date¶meters=%7Csort%3DModification%20date%7Corder%3Ddesc%7Climit=2
[1] https://semantic-mediawiki.org/w/api.php?action=askargs&conditions=Modification%20date::%2B&printouts=Modification%20date¶meters=%7Csort%3DModification%20date%7Corder%3Ddesc%7Climit=5%7Coffset=2
[2] https://semantic-mediawiki.org/w/api.php?action=askargs&conditions=Modification%20date::%2B&printouts=Modification%20date¶meters=%7Csort%3DModification%20date%7Corder%3Ddesc
[3] https://semantic-mediawiki.org/w/api.php?action=ask&query=%7C%3FModification%20date%7Csort%3DModification%20date%7Corder%3Ddesc
James Hong Kong (talk)