encodeURL broken on Tomcat 7.0.28

During page transition wicket used to encode an '../../tisch' which results in an exception:

Caused by: java.lang.IllegalArgumentException
at org.apache.catalina.connector.Response.normalize(Response.java:1799)

The transition (within an ajax call) :

http://localhost:8080/wicket/bookmarkable/de.test.pool.manage.ManagePool?11
http://localhost:8080/tisch

IMHO the double parent ".." is correct

There exists already an bugzilla issue created but rejected as invalid https://issues.apache.org/bugzilla/show_bug.cgi?id=53469.

If the wicket code works as expected there must be an error in the tomcat.
Maybe the wicket development team has closer access to the tomcat developers