The religious enhancer belief to provide relic slots in science buildings seems to apply globally to all civs, and not just to the civ who selects it. I believe the issue is that the "MOD_ENHANCER_BELIEF_RELIC_SLOTS_ON_SCIENCE_BUILDINGS" is set for major players, not owner cities (or some other collection limited to whoever selects it). So if an AI player selects it as a bonus, everyone seems to benefit from it. Not sure if any of the other beliefs are bugged similarly, have not seen any.