Issue: Aztec villager sacrifices can be repeated indefinitely without losing the unit
Basically you can animation cancel the villager before his death and still get the favor
Repro Steps: Pray at the temple and task the villager on the temple again as soon as you get the favor. The death timer will be reset
This video by vega shows it: ¿Otro bug de aztecas microsoft?
Go at 1:20 to see it
edit: the bug applies to quetzalcoatl herdable sacrifices as well. you can fake sacrifice your herdables and still get the eco boost, which is even more broken for me.