Recently, I've found out a MC_POST_FIRE_TEAR callback I was calling runs through tear-copying familiars, namely, Clots and Incubus. In addition, the SpawnerType and SpawnerEntity attributes return the player (or associated values) when called on this callback.
In Afterbirth+, this callback did not run for Incubus, but in Repentance it does. This seems to be intended behavior but there's no way to know for sure.
Recently, I've found out a MC_POST_FIRE_TEAR callback I was calling runs through tear-copying familiars, namely, Clots and Incubus. In addition, the SpawnerType and SpawnerEntity attributes return the player (or associated values) when called on this callback.