Don't preselect a variant on a product page
Current problem: A customer gets onto a product page with a preselected item variant. This specific variant is not on stock, this is why the message "not on stock" appears, even if other variants are on stock. The customer may leave without any further interaction.
Solution: Customer has to switch to his favorite variant and the item displays "in stock" if there is at least one variant in stock.
We do use 9.3 and i don't know if this behaviour might be changed already.