I wish that I could test this, but unfortunately a few weeks ago the Radeon GPU in my laptop died, so there is nothing that I can do. The fact that my GPU is now faulty has nothing to do with the bug, as several people on #4026 have been able to reproduce it. I hope that someone else will be able to test this with the latest mesa.
Just had this happen in 1.16.4. The wandering llama was spitting at a second one and after it died the first keeps on spitting onto the ground, where it was previously standing. I can confirm that after restarting it stops and behaves as expected.
@miwob, I have asked on the mesa bug-tracker, and the bug is still reproducible with mesa git updated from oibaf and MC 1.16.5.