When a percentage sign exists in a field that needs to be sent to another form through the "extraqs" URL parameter, it "breaks" the ribbon by hiding it under a blue bar. See screenshots for visual aid.

This is the method I use to send the extraqs to the newly opened window to the form:
window.open("/main.aspx?etn=new_privatemessages&pagetype=entityrecord&extraqs=" +
encodeURIComponent(extraqs), "_blank", features, false);
The field that is causing this is a lookup field that is meant to be auto-populated through the built in CRMD functionality, using the id and name parameters.
I'm not sure how to fix it. Any ideas?
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