I tried to reproduce your problem but to no avail. I made some tests with this online example
in Firefox and IE and everything works OK - the URL does not get stripped.
For your convenience I made a video showing my tests. Could you try reproduce the problem in the demos? If you can reproduce them there, please send us step-by-step instructions so we can check it. If the problem does not appear on our side, we will need a sample project that we can examine locally.
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