50NL, 100bb eff

BTN opens 2.5x
Hero 3b to 10bb with 6c5c
BTN calls

Flop: Qs 8s 5d

x / b50 / call

Turn: 6h

x/x

River: 4c

b33 / jam (81bb) / hero?

I wound up calling in the moment (villain turned over 77) and feel like it's a pretty substantial mistake. The lead seems fine but to call off the jam appears to be a big blunder.