In blind-vs-blind pots, our strong combo draw versus a small stab is a very clear continue, not a fold.
Flop 2♣ T♥ 3♣ in a heads-up limped pot and we’re out of position. Checking range here is correct; there’s no need to lead. Our hand has very good potential equity on this texture and plays well as a check versus SB’s stab range. Given we’re not the preflop aggressor, we let SB define their range first and keep our own range wide and protected.
Now SB bets 1.9BB into 2BB, and this is where the big error happens. On 2♣ T♥ 3♣ with 5♠4♣, we have both straight-draw equity and a club draw on a low board: this is a classic strong combo draw in a single-raised, limped pot. We’re getting about 2.1:1 (need ~33% equity), and against a typical SB limp–stab range (Tx, some 3x/2x, random overcards, higher clubs, and air), our equity is comfortably above that. Folding here gives up a hand that can hit very clean, very hidden turns and rivers, and that can also be used as an occasional check-raise bluff line. Versus this sizing and stack depth, continuing (mostly by calling, sometimes by raising) is mandatory; folding is a sizable leak.
Note: We folded a very strong draw getting good pot odds against a wide SB stabbing range; this should almost always be a continue, not a fold.