Sorry to report this regression bug.
Installed 3.8.1 on my iPhone to get the “Mix builder screens didn’t allow scrolling to the bottom” fix. The fix resolves that issue. Link to Bug Report
However, now when I use the Search input box on Mix Builder to find an album or artist, the results are there, but there is a bunch of blank space at the start of the search results and I have to scroll down to see them. Also, because of the blank space, It appears there are no matches until you remove the keyboard input and scroll down to see the results.
