Yes, you're right. I mixed up whose gates trigger this bug. All the more a reason not to block it - a conscious IT player would just need to remember to put up at least one stargate other than these two types, for gate-scanning purposes. If one can work around it, why ban it?

Been there, done that myself. By the way - chaffsweeping won't work with the method I thought of. Splitting chaff, sending one into the field, and have the rest follow and merge it will... surprise! - result in a WP0 merge of all chaff, and hitting the field en masse, resulting in all chaff dead, and minimal dent in the field.