Were you around for the disk version of the game? Fixing an issue that can cause a particular problem, doesn't mean that problem can never be caused by anything else, or that every cause of the problem was covered by the fix. People still had problems with the Tingalf quest series after the 1.33 patch, for example.

There are bug fixes in the download version of the game not in the unpatched disk version (such as the magic lockpicks breaking).

BTW, the GOG version is identical to the Steam release.