Based on my testing, the intense battery drain maybe caused by having dual sim active. When I turned off one of my sim cards, the battery drain when in standby mode returned to normal and only drained 1 to 2% for 6 hours. Toggling airplane mode seems to also fixed the battery drain. Let me know if it also works for your galaxy. Tested Phone is samsung s24 exynos version.
Dual Sim Active on standyby:
Single Sim active
