I don’t know if this is a known bug or a feature but I have 2 different securities account linked to the same deposit account.
I put a dividend on GOOGL for the first account on the 17/03 date,
but if I buy on the 2nd account GOOGL on the 21/03, the dividend will be included in the “absolute performance” and “Sum Div” columns using the dividend I used for the first securities account, while in reality, it should be 0 in my mind.
It’s not specifically intended, but it isn’t a simple thing either to link transactions to a securities account. So you shouldn’t hold your breath while waiting for a change.