LDAC Codec Seems Missing After Update (either to 8.1 or to July patch, not sure)

Jul 25, 2018
Like the title says I noticed a few days ago that LDAC is not working anymore. It had been working perfectly since I bought the phone in December with android 7.1 and 8.0. Don't know if it's due to the July patch or the 8.1 update. Is anybody else having this problem? I use Sony headphones with this codec and the Sony application tells me which codec is being used. I noticed that whereas before I was using LDAC now it's using AAC. Does anybody know of a fix?
Nov 19, 2017
I experience the same issue on my stock 8.1 with July patch, using a WH-1000X M2. I'm still not sure if it's caused by the new firmware update in my headphones or if it's caused by the android update.