Hey @ArielCabib - thanks for getting in touch. That is definitely odd. I wasn't able to replicate the issue on my end. Can you try using the discountCodeBasicCreate mutation and letting us know if the issue persists? The priceRuleCreate mutation has been deprecated and while it's still usable, we don't recommend relying on it for implementation - it's possible this could be related to that.
If the issue persists with the discountCodeBasicCreate mutation, just reply back here and we'll definitely take a deeper look. If there is a use case for in terms of needing to continue to use the priceRuleCreate mutation, I'm happy to keep looking into this as well - just let us know!