It was commenters too. As demonstrated by @transisto's example, here. Although, I just found this, from @smooth, in that post's comments:

It's actually not a known "issue", it is intended. The idea being that any high rewards, even buried in comments, would become visible and can be scrutinized by stakeholders for possible downvoting.

It is being removed because maintaining the tree sum on a blockchain isn't feasible if you don't limit the comment depth.

so maybe it's just top-level posts now.