hmm, That's not an answer; that's stating the plain fact of the current situation, which is;
Sorry, we gave you incomplete work, hope you bear with us till we finish it, with special thanks for reminding us; otherwise we will never remember; hmm why not take Windows for a ride and come back later?! .
I was expecting that, cause I found no systemd service related to vm-autostart as compared with v15 files and hence, we have to wait for the next release or maybe v27!
It's really annoying to keep avoid to regret upgrading and go after every release to examine first, which version can work with which kernel and if so, what's available with that version and what's missing?!