This is not a bug. This is a suggestion for enhancement.
Current version (1.5) has the following tab on top of
[article] [discussion]  [history]
[stable article] [article] [discussion]  [history]
What is [stable article]?
It's the automatic display, by the software, of
the "most recent stable version" in the history of an
article. "Most recent stable version" is defined as the
version that is most recent among the "stable
version". "Stable version" is the version that "exist"
for a time T > T0. T0 is chosen the "bureaucrat", after
a concensus of the community, for example "1 month".
The "existence time" of a version is the different
between it's "creation time" and it's next
version's "creation time".
Most recent stable version can be extended to not
include "stub" pages (pages in category stub).
How may it function?
*External link to Wikipedia article can be set to
*Un-registered user can be, by default, direct to
stable version when searching/browsing Wikipedia. If
he/she is interested in newest version (possibly
unstable) and in editting it, click the appropiate link.
*For registered user, everything behave normally,
except extra tab of stable version.
*This new feature can be an option for the entire
Wikipedia site. Bureaucrat can turn it on or off at
Why is it interesting?
*External website can create link to stable Wikipedia
article whithout warrying about unstability
*Wikipedia becomes closer to a directly linkable source
of stable information (therefore of some degree of
ensured quality), hence be more useful for the
Probabaly people have thought about this, though I have
not seen it here. If it's not here yet, hope people
will comment and refine this idea. If it gains interest
in the community, hope people would develope this into
reality. I regret that currently, I don't have time to
hack and create a patch for this.