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Were you perchance using cerebella?
Cerebella, Eliza, Painwheel, Filia, Valentine. Pretty much every fighter I've used has experienced this recently (aside from Big Band if memory serves me).
I dont know about other chars but i’ve definitely noticed it happening a lot during cerebella throw animation recently.
A few updates ago I faced the same thing. Not at all recently. I reason Lag and phone performance factor into fighter reaction. Because sometimes I’d be doing L5 like million times before and have combo counter turn red. Me tapping too slow physically is impossible so the above is the only thing I can think of.