Follow-up Comment #3, bug #18877 (project wesnoth):
Anonymissimus, hopefully the following answers your two posts.
Summary: it does occur in a certain case, may possibly occur in others, and
might just be a MP Campaign bug.
The duplicate underlying_id bug does occur without the umc author modifying
it. However, this might classify as a MP Campaign Bug (which are currently
unsupported)
It can (and does) occur under the following condition:
Any time someone stores units in persisent variables and unstores them in
another game. (Might be limited to MP, keep reading.)
This has occured when I was writing my Custom Campaign add-on, and I added
code to alter underlying_id specifically to prevent such collisions. (Maybe
that means Custom Campaign is a "hacky modification" :D )
I do remeber hearing of at least one other add-on using persistence to allow
a player to use their army again for an MP Campaign once they have completed
it; this bug might show up there as well.
It might occur under the following conditions:
It's possible that this does not occur in SP, as SP has [side]
persistence=yes; which might in it's opperation prevent such things from
occuring in how the units are stored between scenarios (I'm not familar with
that code to be sure)
In MP, [side] persistence=yes; does not work for any scenario which uses
random maps (which is a seperate bug I have yet to draw up a report for, and
classifies as an MP Campaign Bug) and add-ons like World Conquest and Random
Campaign might have underlying_id collision problems occur because they need
to resort to using [store_unit],[unstore_unit] to pass the army between
scenarios. (Though there is some linking of scenarios, even though parts are
broken, as such their operation is slightly different than those that unstore
from a global persistent var.)
I say might occur here because I haven't observed it yet myself, the nature
of the bug is such that you have to be paying attention for it, and if your
recall list is long, (ie, 15+ units) it would be easy to miss one or two units
dissappearing between scenarios) Though the post I linked to below suggests
it's occurance in MP Campaigns
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