There is new version available: https://github.com/prusa3d/PrusaSlicer/releases/tag/version_2.7.0
Unfortunately, it is a bit more than just a version bump. I think. It requires two libraries that are not in Gentoo rn (heatshrink and libbgcode). I have botched ebuilds for these, but they are very experimental. Feel free to try it - https://bitbucket.org/szymonsz/gen2-overlay/commits/e899ad6ca36cf3fab5abb3ea045ca307718258d1
we have 2.7.2 in the tree now, closing