When more than one campaign value is present in the session/segment, promotions are not triggered correctly. None of the campaigns will be considered.

Simulation

• Create two campaigns for a given context;
• Create a promotion with a percentage discount for any of these campaigns;
• Login with a customer that is able to receive both campaigns;
• Observe the Segment cookie with two campaigns, following the pattern "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa,bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb" for its string;
• Observe the promotion won't be applied to the expected products.

Workaround

There's no workaround available, but the promotion will work properly if only a single campaign is applied to the context.