Ajax breaking multiline select habtm parameters

I have a journalist and publication model related with a habtm. In the
edit
journalist form there is a multiline select for publications.
When :remote => false this works well, the parameter for the
publications
looks like:
publication_ids"=>["", “4256”,“4271”]

BUT if I use :remote => true the parameter array allways has size = 2:
publication_ids"=>["", “4256,4271”]
The quotes are missing and only the first relation gets saved.

Since the problem is only in the ajax call I don’t think I have done
anything wrong.

Rails 3.2.12, Ruby 1.9.3-p374. This is quite an old application so I use
prototype.

Hs anyone experienced this, what can be the cause?

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