Bug - Normal Stage Hazard not knocking down opponents with unflinching

[MatchHog]

Self-explainatory title. Blockbuster hits are supposed to knock down characters with unflinching, but Stage Hazard doesn't, on initial hit or any of the following.
This feels like it should be a known issue but I haven't seen it addressed

 

[Bones]

Thanks for the report, we'll take a look!