Note I am not the maintainer of this recipe and I just want to see BlueZ being up to date, especially before new LTS :)
I ran the ptests locally and all of them passed. I did not verify if BlueZ 5.86 builds with musl.
Below are the steps I used to test:
1) run: bitbake core-image-ptest-bluez5
2) run: runqemu qemux86-64 core-image-ptest-bluez5 slirp nographic snapshot
3) run: /usr/lib/bluez5/ptest/ptest-runner bluez5