having imported from a previous version (2.3.2) entire courses whit quiz and questions, being on questions repository and choosing a category

domainname/question/edit.php?cmid=621&category=215%2C2055&qbshowtext=0&recurse=0&recurse=1&showhidden=0&showhidden=1

every question edit/duplicate url is presented like this

domainname/question/question.php?returnurl=%2Fquestion%2Fedit.php%3Fcmid%3D621%26cat%3D215%252C2055%26qpage%3D0%26recurse%3D1%26showhidden%3D1%26qbshowtext%3D0&cmid=621&id=2824

the url is wrong and the link leads to Dashboard; the problem seems to reside in the value of the "cat" parameter, which in this example is 215,2055: in first place it becomes 215%2C2055 then again encoded in 215%252C2055 (% of the first %2C enconding is encoded again);

in some cases, the "cat" parameter is encoded only once (eg. 215%2C2055), but the link leads always to Dashboard;

preview and delete urls are working correctly (besides the same "cat" parameter encoding);

the same behaviour could affect question creation because after chosing the question type (eg. true/false) in the modal popup redirection leads to Dashboard instead of proceeding