I wrote out that I agreed with you and then checked stack sizes. I think whiffed draws are pretty likely to check behind since they can't expect much FE here, so we can't expect much benefit from checking. The benefit of betting is to get money out of weak hands hoping you've completely missed like a diamond draw that paired the turn or river.

P.S. I think you made a mistake in OP. 89d almost definitely checks behind this river, as he would've made second pair. A hand like QTd or Axd may take a stab.