I am experiencing the same thing right now. Windows 11, WSJT-X v2.5.4, Yaesu FTDX10. 20 meters (14.074) is fine, 40 meters (7.074) no decoding. It used to work. Set to LSB on 40 meters, USB on 20 meters. I have an ICOM 7300 and I will try it on 40 meters tonight.