Weird Flop Donkbet in 3BP

GG Poker - $0.05 Ante $0.02 NL - Holdem - 7 players
Hand converted by PokerTracker 4

MP: 198.2 BB
CO: 292.8 BB
Hero (BTN): 212.2 BB
SB: 22.6 BB
BB: 209.8 BB
UTG: 301.2 BB
UTG+1: 120 BB

7 players post ante of 0.4 BB, SB posts SB 0.4 BB, BB posts BB 1 BB

Pre Flop: (pot: 4.2 BB) Hero has J♥ Q♣

fold, fold, fold, CO raises to 3 BB, Hero raises to 11 BB, fold, fold, CO calls 8 BB

Flop: (26.2 BB, 2 players) J♦ A♣ K♥
CO bets 8.8 BB, Hero calls 8.8 BB

Turn: (43.8 BB, 2 players) 2♥
CO bets 14.6 BB, Hero raises to 54.8 BB, CO calls 40.2 BB

River: (153.4 BB, 2 players) T♦
CO checks, Hero bets 137.2 BB and is all-in

Preflop low frequency 3bet. Flop gives me nut- and range-advantage, however, villain decides to donk lead for some reason. I am not sure what to make of it. Usually this indicates a medium strength hand like low Axs -- could raise and pressure right away, however, decided to just call this time. Turn same situation. With Jh I decided to raise now. Unexpected river, i can see some arguments for sizing down to give villain more incentive to call -- it's very hard to find bluffs within my range. Allin size also might just isolate against other straight combos. What line would you take?