hash fragment gets dropped when some special characters are present (period, slash...)

I'm getting some weird behavior with Activities&Places (GWT 2.4.0 and 2.5.1), in FF 20/21/Chrome/Safari 6, both prod and dev mode. 

Here's an example:

with @Prefix("!contact") these two urls work just fine ('contact' place, token first empty then 'department'): 

http://127.0.0.1:8888/?gwt.codesvr=127.0.0.1:9997#!contact:

http://127.0.0.1:8888/?gwt.codesvr=127.0.0.1:9997#!contact:department 

but when I try to open: 

http://127.0.0.1:8888/?gwt.codesvr=127.0.0.1:9997#!contact:department/1

the url gets rewritten to:

http://127.0.0.1:8888/!contact:department/1

and the app goes to the default place (historyToken is empty) and there's a 404 because !contact doesn't exist. Debugging this I get to c.g.g.user.client.impl.HistoryImpl.java#133 newItem() that is called with an empty historyToken so this happens before any tokenizers get called. The same happens when token contains period/dot (.) or question mark. Anyone seen this before? 

It's been known this can happen because of 3xx redirects, but this is not the case here (then all fragments would be dropped). To be sure this is not the case, I tried this with a redirect: a simple filter to remove "index.html" so that 127.0.0.1:8888/index.html?gwt.codesvr=127.0.0.1:9997#!downloads: gets redirected to 127.0.0.1:8888/?gwt.codesvr=127.0.0.1:9997#!downloads: and it works correctly. Inspecting HTTP requests under the hood also doesn't show any 3xx responses when hash gets dropped.

Could this be a bug?

regards,

Milan

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