Hi Andrew,
Honestly I’m not sure whether it will be fixed by next week.
However, I’ve just written a workaround
https://run.pavlovia.org/vespr/survey-group
To launch a survey create a URL of the form
https://run.pavlovia.org/vespr/survey-group?surveyID=733492ba-8997-416b-9c8c-4fe08c3519bc&groups=3
This will launch survey 733492ba-8997-416b-9c8c-4fe08c3519bc and randomly allocate a value for group between 1 and 3.
Please test.