I was running around my building world for the beta, and when I got to a build of which had Crimson and Warped planks along with several other types, they ALL made the same sound as regular wood logs. When I switched to another world on 1.16.1, the Crimson and Warped planks made fungi stem sounds as they should. If additional information is needed I will supply it to this report. (If the moderators or developers feel like the summary makes no sense, it can be rephrased)