Operative Class character with an Operative edge +1 adds
Jack of All Trades (Ex) is not doubling Operatives Edge for zero Rank Skills
Jack of All Trades (Ex)
[Paizo - Starfinder Core Rulebook, p.95]
You've learned how to handle any situation. You can use all skills untrained, and you double your operative's edge bonus when using a skill in which you have no ranks.
After adding Jack of All Trades (Ex) some untrained skills are missing (such as Engineering) from the PC sheet and all zero level skills only have +1 mod from Operatives Edge instead of doubling to +2.