When using gradereport_user_get_grade_items if one of the grade items has a trailing space or contains"&" the API will return an error.

debuginfo: "usergrades => Invalid response value detected: gradeitems => Invalid response value detected: itemname => Invalid response value detected: Invalid external api response: the value is \"Assignment 1 \" of PHP type "string", the server was expecting "cleanhtml" type"

errorcode: "invalidresponse"

exception: "invalid_response_exception"

message: "Invalid response value detected"

E.g. if I have an assignment named "Assignment 1 " (trailing space) I will recieve an error
if it is named "Assignment 1" It will work correctly.
This was running correctly, though we have recently upgraded from 4.1.5 to 4.1.6 (not sure if related)
I have also received some other similar errors from another function