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I've cloned and tested your form. At the first, I was able to reproduce the same issue that you're having the google spreadsheet integration was blank. However, I removed the integration and added it again. Now it seems it is working properly on my side.
Could you also remove your integration and re-integrate your Google spreadsheets Integration again?
It should fix the issue. If you have any question or issues, please do not hesitate to contact us. We will be glad to assist you.