The issue is python3.9, the bug report has the details:
FL-10643 [next]: equery has problems getting the use flags from ebuilds
A workaround would be to install dev-lang/python-3.7.16,then use eselect python list, and eselect python set the [ ] by python3.7 so it becomes [1]
rj@funtoo-next ~ $ ego query v python
dev-lang/python| slot| repo
----------------+-----+----------------
* 2.7.18-r1| | python-kit/next
----------------+-----+----------------
* 3.7.16| /m| python-kit/next
----------------+-----+----------------
3.8.16| | python-kit/next
* 3.9.16| | python-kit/next
3.10.11| | python-kit/next
rj@funtoo-next ~ $ eselect python list
Available Python interpreters, in order of preference:
[1] python3.7
[2] python3.9
[3] python2.7 (fallback)