Here is a hand where all 3 players are All-In on the flop (i.e., there is no further action after the flop) yet, the All-In Adj BB reflects the EV after the river though.
The calculation is flawed and incorrect.
I have attached the hand replayer video and a screenshot of the All-In Adj BB.
Below is the hand history text.
Winning Poker Network (Yatahay) - 150/300 NL (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4: http://www.pokertracker.com
Hero (SB): 53.39 BB
BB: 7.9 BB (VPIP: 27.91, PFR: 6.98, 3Bet Preflop: 0.00, Hands: 43)
UTG: 12.85 BB (VPIP: 26.67, PFR: 11.63, 3Bet Preflop: 2.08, Hands: 137)
MP: 73.37 BB (VPIP: 12.66, PFR: 8.42, 3Bet Preflop: 0.64, Hands: 397)
CO: 40.8 BB (VPIP: 25.00, PFR: 25.00, 3Bet Preflop: 50.00, Hands: 4)
BTN: 28.28 BB (VPIP: 64.15, PFR: 13.46, 3Bet Preflop: 5.88, Hands: 55)
6 players post ante of 0.13 BB, Hero posts SB 0.5 BB, BB posts BB 1 BB
Pre Flop: (pot: 2.3 BB) Hero has Ts Ks
fold, fold, fold, BTN raises to 2 BB, Hero calls 1.5 BB, BB raises to 7.77 BB and is all-in, BTN calls 5.77 BB, Hero calls 5.77 BB
Flop : (24.1 BB, 3 players) 2d Kc 7s
Hero checks, BTN bets 1 BB, Hero raises to 45.49 BB and is all-in, BTN calls 19.38 BB and is all-in
Turn : (64.86 BB, 3 players) 7h
River : (64.86 BB, 3 players) Ac
Hero shows Ts Ks (Two Pair, Kings and Sevens)
Main Pot [24.1 BB]: (Pre 39%, Flop 90%, Turn 95%)
Side Pot [40.76 BB]: (Pre 41%, Flop 90%, Turn 95%)
BB shows 6c As (Two Pair, Aces and Sevens)
Main Pot [24.1 BB]: (Pre 16%, Flop 2%, Turn 2%)
BTN shows Qh Ah (Two Pair, Aces and Sevens)
Main Pot [24.1 BB]: (Pre 45%, Flop 8%, Turn 2%)
Side Pot [40.76 BB]: (Pre 59%, Flop 10%, Turn 5%)
BB wins 12.05 BB
BTN wins 52.81 BB