Hi,
I just encountered this bug today. I can not save my change of any field in any catalog item. There is always an error "InvalidItemProperties". I don't know what it means without any further details. I tried uploading json to Catalog but still met the same error.
My catalog has been used for a long time and never meets this issue. I don't think there should be anything wrong with the data itself.
My title is D95A. If you need, you can test with Bundle/com.zinggames.pinballquest.flexible002dollars. Add a '.' at the end of the Description and save the change.
Thanks,