I think this issue inadvertetly introduce a new error with the new load more feature in the latest update: Variants deselected in Resource Picker if “Load all variants” isn’t reloaded where if have a product which its variants exceed the load more pagination and select the complete product, in this case it only selects the visible variants before the load more button. You have to click on the load more button then select the complete product to select all its variants. Im pretty sure this is not the intended behaviour and I hope this is fixed soonish haha 
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