We found this issue when working in a default Magento2.1Magento2.1.
While creating custom optionscustomizable options for a product, if I select the drop-down field a second timesecond time, the spinner never stopspinner never stop loading.
Please find the below screen-shot:
I think this is a Magento2Magento2 core bug, can anyone confirm and suggest how to fix it?
Thanks