[Rpm-maint] [rpm-software-management/rpm] Why are two identical NEVRA packages output after executing the rpm -q xxx command? (Issue #2171)

[linux-gcc]

First of all thanks!
Will the old version of rpm be interrupted during the rpm -U upgrade process, will it also cause this package duplication problem?
Why does --rebuilddb fix this problem? Judging from the implementation of the --rebuilddb code, only the entries without RPMTAG_NAME, RPMTAG_VERSION, RPMTAG_RELEASE, RPMTAG_BUILDTIME will be skipped when --rebuilddb BDB? Now when this problem occurs, I can query NAME, VERSION, RELEASE, BUILDTIME, but the tags of the two packages are exactly the same.
In addition, how is the new version of rpm optimized for this problem?

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