I have exactly the same issue.
I’m a windows user, new to psychopy3 but have not been closing the runner view habitually.
It seems that if I convert my builder view to a coder view and open the script from psychopy rather than double-clicking, it does send the print statements/errors etc to stdout. However I can’t do this at all from the builder view no matter which way I open it and regardless of the runner opening/closing. It makes it really hard to debug small snippets of code for simple experiments that can be done in the builder view.
Do you know roughly when you’ll have a fix? Thank you!!