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I was able to replicate mentioned issue.
I will escalate this issue to our developers and we will inform you via this thread once this issue is resolved.
For not as possible workaround you can get embed code of the SlideShare. Copy the code from the Embed field.
Then add Text field to your form and paste Embed code to that field.
Here is my demo form: https://form.jotform.com/62026192126953
Feel free to clone it.