Jupiter in Gemini may feel that something is missing for them to feel complete and confident. This system considers the position adverse and describes it as a sense of disadvantage.
They may give in too much and take part in activities they don’t want because they find it hard to say no. That difficulty in setting limits can also take them away from what brings them joy.
When exercising authority, they run the risk of swinging from excessive permissiveness to sudden imposition when they feel their trust has been taken advantage of. The change of tone doesn’t necessarily make others recognize the limit they had not expressed before.
In business or dealings with friends, it’s especially important to clarify conditions and responsibilities. The problem this reading points to is the difficulty of defending their own interests when they fear harming the personal closeness.