To reproduce, create a new calculated question:

• In "Question text" write "{a}"
• In "Answer 1 formula =" write "{a}/2"
• In "Grade" write "100%"
• Click "Save Changes"
• In "Wild card {a}" choose "Will use an already existing shared dataset"
• Click "Next page"

What you get is an error like this:

      Field "questionid" does not exist in table "quiz_slots"

The stack trace:

Stack trace:

• line 672 of /lib/dml/moodle_database.php: dml_exception thrown
• line 1919 of /lib/dml/moodle_database.php: call to moodle_database->where_clause()
• line 1762 of /question/type/calculated/questiontype.php: call to moodle_database->count_records()
• line 133 of /question/type/calculated/datasetitems_form.php: call to qtype_calculated->print_dataset_definitions_category_shared()
• line 214 of /lib/formslib.php: call to question_dataset_dependent_items_form->definition()
• line 114 of /question/type/calculated/datasetitems_form.php: call to moodleform->__construct()
• line 412 of /question/type/calculated/questiontype.php: call to question_dataset_dependent_items_form->__construct()
• line 201 of /question/bank/editquestion/question.php: call to qtype_calculated->next_wizard_form()

The code that is causing the exception is here:

https://github.com/moodle/moodle/blob/73d604369d26e7dda837b1ce5a5564dbe2054015/question/type/calculated/questiontype.php#L1762-L1768