It really is time for this to be clarified in the “i” text by Tidal sound quality. The suggestion to do this was made months ago. @Wheaten are you able to nudge whoever can do this?
They should know. It’s a side effect from the Tidal change when they dropped MQA. With “Highest possible” Tidal just throws whatever suits them back.
So far setting it to “Hi-Res” by-passes it.