The audiofile (fleshwork.wav) in 3.85 is the exact same as it is in 3.841 (1,374,240 bytes, dated March 22, 2024)
I don't see any changes in the SDL2 files either, or no mention of anything audio in the news.txt
Can you try to copy the 3.841 fleshwork.wav to overwrite the file included in 3.85 Stable?