https://www.youtube.com/watch?v=17W070HB4dg
In this video, a Venx's Head Ram is outsped by a Nessla's Strangle. There is no Deceit Aura in play, so given how priority works, this should not be possible. I believe this was -5 speed stages on Venx, which isn't even all that many for this to occur.
This does not appear to affect *>>> priority - I tested a +8 speed stages Loali using Gust against a 0 speed 1 speed SV Gazuma using Cage, And Gazuma still went first. It appears that in editing how - prio moves work in Deceit Aura, some change was made that is affecting the priority outside of DA.
New bug" tag. Can we get confirmation that this is or is not a bug or whether "- Prio" was deliberately changed to be 0.25x without notice?