Nexus doesn't work properly with Vaadin Add-ons

To reproduce the issue:

<repository>
<id>vaadin-addons</id>
<url>http://maven.vaadin.com/vaadin-addons</url>
</repository>

<dependency>
<groupId>org.vaadin.addons</groupId>
<artifactId>flexibleoptiongroup</artifactId>
<version>1.0</version>
</dependency>

Expected result: build successful

Actual result:
Missing:
----------
1) org.vaadin.addons:flexibleoptiongroup:jar:1.0.0

Try downloading the file manually from the project website.

Then, install it using the command:
mvn install:install-file -DgroupId=org.vaadin.addons -DartifactId=flexible
optiongroup -Dversion=1.0.0 -Dpackaging=jar -Dfile=/path/to/file

Alternatively, if you host your own repository you can deploy the file there:

mvn deploy:deploy-file -DgroupId=org.vaadin.addons -DartifactId=flexibleop
tiongroup -Dversion=1.0.0 -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -Drep
ositoryId=[id]

Path to dependency:
1) cl.spitec.s3tgo.vaadin:S3tGo:war:1.1
2) org.vaadin.addons:flexibleoptiongroup:jar:1.0.0

----------
1 required artifact is missing.

for artifact:
cl.spitec.s3tgo.vaadin:S3tGo:war:1.1

from the specified remote repositories:
nexus (http://integracion-s3tgo:8082/nexus/content/groups/public)