This is absolutely such a minor/small change, but its something that keeps coming back to mind.
When they were introduced, it was said that the acid puddles covering the various mushtrees were placeholder, and some other designs were even showed off on stream, but ultimately they went untouched for the duration of the beta and remain the same current day.
They look the same as they did during the beta, and both them and the trees themselves are still low quality, making them sort of stick out.