Redirect with datagroup not working for keys longer than 31 chars

we have a strange behaviour in our F5 and we think it changed with version 14 - before it was ok.

In our iRule we do redirect based on a datagroup:

if { [ class match "https://www.xxx.de/zzzz/" eq redirects ] } {
    HTTP::respond 301 noserver Location ....
}

the datagroup entries look like: "https://www.xxx.de/bild/" := ";,

As long as the length of the key is smaller than 32 chars everything works fine. For 31+ chars the match does not happen. The request goes through to the server without redirect and the result is a 404 because the page is not found. The following datagroup entry does not work: "https://www.xxx.de/bild/xxxxxxxxxx" := ";,

The version of our BIG-IP:

• BIG-IP 14.0.0.3 Build 0.0.4 Point Release 3
• we are using the virtual edition