to add: following the suggestion from another thread, I looked at the developer tools -> network output and this is the failing requrest (I think)
endpoint: {name: "tasks.get_all_ex", requested_version: "2.12", actual_version: "1.0"} error_data: {} error_stack: null id: "8be33097ac824ef2bc40dded2bfc5fe8" result_code: 500 result_msg: "Internal server error: err=Cannot resolve field "null", extra_info=None" result_subcode: 1 trx: "8be33097ac824ef2bc40dded2bfc5fe8"And also this

endpoint: {name: "tasks.get_all_ex", requested_version: "2.12", actual_version: "1.0"} error_data: {} error_stack: null id: "8b1901c0d3e34250bee8a8f3b919a71f" result_code: 400 result_msg: "Missing required fields (page_size is required when page is requested): field=page_size" result_subcode: 11 trx: "8b1901c0d3e34250bee8a8f3b919a71f"