Please double check and add python 3.13 see line 38: PYTHON_COMPAT=( python3_{10..12} )
I have it since January with 1.24.11. Using python 3.13 only systemwide. No issues so far. This 1.24 PR had it but it has not been merged. https://github.com/gentoo/gentoo/pull/38635/commits/6a0329da66c7902425bff0a2f0965d000ad02674