Creator ignores run settings for webassembler

Created a webassembler project and tried to run it. In the run section there is a label

"Effective emrun call:"

I tried to change the  setting of the associated QTextEdit which is

/usr/bin/python3 /usr/bin/emrun.py --port '<port>' --no_emrun_detect --serve_after_close ...

and wanted it to use the emrun.py path on Ubuntu. But the changes are ignored. No matter what I fill in this QTextEdit  creator will allways run the same initial setting and ignores my choice.