Assembly Plugin is looking for SNAPSHOT artifacts in release repositories

Assembly plugin fails to retrieve snapshot with unique version from repository, and as a result the generated zip file contains signatures-xades-1.2-SNAPSHOT.jar instead of signatures-xades-1.2-20111121.181823-3.jar.

Descriptor:

<assembly>
  <id>bin</id>
  <formats>
    <format>zip</format>
  </formats>
  <includeBaseDirectory>false</includeBaseDirectory>
  <dependencySets>
    <dependencySet>
      <outputDirectory>lib/</outputDirectory>
      <useProjectArtifact>false</useProjectArtifact>
    </dependencySet>
    <dependencySet>
      <outputDirectory>/</outputDirectory>
      <useProjectArtifact>true</useProjectArtifact>
      <includes>
          <include>${project.groupId}:${project.artifactId}</include>
      </includes>
    </dependencySet>
  </dependencySets>
</assembly>

Maven debug output (-X) contains:

[DEBUG] Resolving project dependencies transitively.
[DEBUG] lt.mitsoft.vmi:eds3-batch:war:1.0-SNAPSHOT (selected for null)
[DEBUG] lt.mitsoft.vmi:eds3-mdoc:jar:1.0-SNAPSHOT:compile (selected for compile)
[DEBUG] lt.mitsoft.adoc:adoc-core:jar:1.1:compile (selected for compile)
...
[DEBUG] lt.mitsoft.pki.signatures:signatures-xades:jar:1.1:compile (selected for compile)
...
[DEBUG] Verifying availability of C:\Users\Donatas\.m2\repository\lt\mitsoft\pki\signatures\signatures-xades\1.2-SNAPSHOT\signatures-xades-1.2-20111121.181823-3.pom from [central (https://int.mitsoft.lt:3681/artifactory/repo, releases), google (http://mbari-maven-repository.googlecode.com/svn/repository/, releases), org.tmatesoft.svnkit-releases (http://maven.tmatesoft.com/content/repositories/releases/, releases)]
[WARNING] Missing POM for lt.mitsoft.pki.signatures:signatures-xades:jar:1.2-SNAPSHOT: Error resolving project artifact: Could not find artifact lt.mitsoft.pki.signatures:signatures-xades:pom:1.2-20111121.181823-3 for project lt.mitsoft.pki.signatures:signatures-xades:pom:1.2-SNAPSHOT
[DEBUG] lt.mitsoft.pki.signatures:signatures-xades:jar:1.1:compile (removed - nearer found: 1.2-SNAPSHOT)
[DEBUG] lt.mitsoft.pki.signatures:signatures-xades:jar:1.2-SNAPSHOT:compile (selected for compile)
...

The problem is that artifact signatures-xades-1.2-20111121.181823-3.pom (that is, signatures-xades-1.2-SNAPSHOT) is being looked-up in release repositories (as shown above):

[central (https://int.mitsoft.lt:3681/artifactory/repo, releases), 
google (http://mbari-maven-repository.googlecode.com/svn/repository/, releases), 
org.tmatesoft.svnkit-releases (http://maven.tmatesoft.com/content/repositories/releases/, releases)]

The culprit might be the dependency override:

[DEBUG]   lt.mitsoft.pki.signatures:signatures-xades:jar:1.1:compile (removed - nearer found: 1.2-SNAPSHOT)
[DEBUG]   lt.mitsoft.pki.signatures:signatures-xades:jar:1.2-SNAPSHOT:compile (selected for compile)

The first candidate was signatures-xades:jar:1.1 (release), but the chosen artifact is signatures-xades:jar:1.2-SNAPSHOT. I guess the repository type was chosen based on the first candidate, and this is wrong.

Even bigger problem is that since POM retrieval failed, all dependencies specified in signatures-xades-1.2-20111121.181823-3.pom were not being taken into account (and are absent in generated zip file).