"there is one event not implemented correctly and that is when opponent has both Counterspell and Spellbender. If you cast a spell on a minion, it triggers counterspell but not spellbender (it probably has some kind of precedence), but AC already removes spellbender as an possible secret, even tho it's still active."
from https://www.reddit.com/r/arcanetracker/comments/7aukwi/v230_secret_detector/:
"there is one event not implemented correctly and that is when opponent has both Counterspell and Spellbender. If you cast a spell on a minion, it triggers counterspell but not spellbender (it probably has some kind of precedence), but AC already removes spellbender as an possible secret, even tho it's still active."