Hi Yuan Lin,
thanks for reporting this.
Yes, this is because of the recent addition you are referring to,
which I find a bit problematic, even though I understand the intent.
It is good to be able to navigate the agenda commands dispatch window
but losing the SPC key is too high a price for
Remember to cover the basics, that is, what you expected to happen and
what in fact did happen. You don't know how to make a good report? See
https://orgmode.org/manual/Feedback.html#Feedback
Your bug report will be posted to the Org mailing list.
