Another odd river donk

[BorisTheSpider]

Another unknown

Poker Stars, $0.05/$0.10 No Limit Hold'em Cash, 6 Players
Poker Tools Powered By Holdem Manager - The Ultimate Poker Software Suite.

BTN: $17.65 (176.5 bb)
SB: $18.19 (181.9 bb)
BB: $8.96 (89.6 bb)
UTG: $7.39 (73.9 bb)
Hero (MP): $16.35 (163.5 bb)
CO: $12.49 (124.9 bb)

Preflop: Hero is MP with 2 2
UTG folds, Hero raises to $0.30, CO folds, BTN raises to $0.50, 2 folds, Hero calls $0.20

Flop: ($1.15) 9 T T (2 players)
Hero bets $0.60, BTN calls $0.60

Turn: ($2.35) 5 (2 players)
Hero checks, BTN checks

River: ($2.35) 7 (2 players)
Hero checks, BTN bets $1.20