I don't know what the problem is, but I ran BZ2 ever since Wine 9.0 and it has always worked. The minor problems are being fixed by people reporting them to the Wine Bugzilla. I now use then 1.1.0 version awith BZ2 version 1.2 and Public Beta 1.3 versions 3 and 4a. They seem to work for the most part. I noticed they broke the video frame rate in the newer Wine versions. Always install Wine then onfigure and install BZ2 clean, then patch.