Villain is 46/18 and not very aggressive over 200+ hands, but it barely matters because they simply posted small and big after being away for this hand.

As you can see, I sort of froze up on this hand and didn't know what to do because of how little information I had for narrowing villain's range at all. That combined with how easily I could valuetown myself against Q7, Q4, 77, and 44 (maybe Q3 but that'd be bananas), and I got nervous.

In retrospect, I think checking the turn was a very weird decision.

But is this hand just so unusual that it's best to play it safe or am I just always missing oodles of value here?

If villain had VPIP'd preflop at all, I could conceivably decide "well, there's not a ton of Q7 or Q4 in their flop calling range; it's going to be far higher cards than that most of the time". But they can literally have any four here.

Dealt to Hero: 3 3 K J

UTG Folds, HJ Folds, CO Checks, BTN Folds, SB Calls $0.15, HERO Checks

Hero SPR on Flop: [8.55 effective]
Flop ($0.85): 3 Q Q
SB Checks, HERO Bets $0.85 (Rem. Stack: 28.51), CO Calls $0.85 (Rem. Stack: 26.99), SB Folds

Turn ($2.55): 3 Q Q 7
HERO Checks, CO Bets $2.55 (Rem. Stack: 24.44), HERO Calls $2.55 (Rem. Stack: 25.96)

River ($7.65): 3 Q Q 7 4
HERO Checks, CO Bets $3 (Rem. Stack: 21.44), HERO Calls $3 (Rem. Stack: 22.96)

You both played the hand well.