It seems like hurtboxes aren’t standardized across a character’s normals. The above video demonstrates a combo that works when hitting Ken normally (standing or crouching), and when counterhitting him out of his cr.lk, that suddenly breaks when counterhitting his cr.lp.
I tested the entire cast’s cr.lp, and got a list of offending characters - Ryu, Ken, R.Mika, Necalli, Laura, and Birdie. R.Mika is especially egregious because both her cr.lk and cr.lp have the wonky hurtbox. It’s possible other normals have the same type of wonky hurtbox, but I’m too lazy to go through and check the game’s full movelist. Caveats: I only tested this in training mode, so it is possible this is a training mode wake-up action only bug. I only tested this using a meaty setup, so it’s possible that this is a counterhit hurtbox only issue, but that seems unlikely.
Ryu’s st.mp, cr.hp isn’t the only combo that breaks. after a ch cr.lp, st.mp, his cr.mk fails to connect as well. It seems to be the affected cr.lps have a hitstun animation with more pushback than the ‘default’ hitstun animation. Haven’t rigorously tested to get a list of combos that break, so maybe it just screws over Ryu.
I definitely consider this a bug and would like it fixed. Apologies if it’s old news.