Probably, but it saves quite a bit of time and hair for a tester and avoids inspecting the whole bug history and all the comments to find out an exact version that an original reporter had used. There are bug reports where somebody comes and says "The bug is back!", so in order to test whether this is a regression or the bug was never fixed one needs to test using an original Wine version.
In a situation like that you should be inspecting the comments anyway. The only difference if we change the version field is that you have to open the bug history, search for Version, and read the first entry to find out what the original reported version was (if that first entry is wrong, there will be a comment explaining what it actually is and why). And inspecting the comments will be faster because they won't be cluttered with "still present in x.y.z".