I think Blueprint's probability to trigger when next to Space Joker is not coded correctly. Since they can trigger independent of each other, with one or both upgrading a hand, each should have a 1/4 chance independent of the other's success.
But I've had five hands in a row where neither triggered. The odds of getting at least one 4 when rolling two 4 sided dice is 43.75%. The odds of an event with a 43.75% chance event not happening after 5 succesive tries is about ~1.6%. Technically possible, but unlikely enough mention.
Maybe Blueprint is running the probability for failure twice and the code may be making it a 1/16 chance? Worth double checking. Ps. Thanks for such a wonderful game ❤️ 🃏