So I got an AI that will follow the player on gaining LoS, however they will not stop chasing the player until they make physical contact where they run back to their guardtarget. There is obviously a LoS system implemented as after this they will not chase again until the player goes in front of them, additionally I have a printing part in their blueprint to say ‘I saw you!’ in the interface when LoS is triggered. This occurs as expected, even when the AI loses LoS, but they continue to chase the player around or behind objects as though they still had LoS rather than ‘forgetting’ about the player immediately, they only ‘forget’ the player when they make physical contact.
I have screencaps of the blueprints and the behaviour tree here;