This post is about a similar bug that was fixed in the winter 2018 patch. I have seen this bug happen on both the current 1.0.0.290 patch and last patch.
When you build a large number of apostles over time, eventually new apostles will start to lose options for promotions (down from 3 to 2 or 1). I have seen the number of promotions go from 1 or 2 options back up to 3 on the next built apostle. However, sometimes you will no longer be able to promote future apostles, which I suspect is if the number of options reaches 0. The options might also sometimes appear as the same promotion options over and over, but this is not a constant with my testing.
I have done a number of test games on the last patch and a couple on the current patch to try to gain insight on why this bug happens. This bug appears for me with Mont St Michel built and not built. It appears first usually when apostles cost around 500 faith, but it might occur earlier or later. Most of the time I run out of promotion options sometime around when apostles cost over 1000 faith.
In the attached save game you can reproduce this bug, if you buy an apostle in Ra-Kedet, end the turn, and then promote the apostle next turn. It should then only have two promotion options.
When you build a large number of apostles over time, eventually new apostles will start to lose options for promotions (down from 3 to 2 or 1). I have seen the number of promotions go from 1 or 2 options back up to 3 on the next built apostle. However, sometimes you will no longer be able to promote future apostles, which I suspect is if the number of options reaches 0. The options might also sometimes appear as the same promotion options over and over, but this is not a constant with my testing.
I have done a number of test games on the last patch and a couple on the current patch to try to gain insight on why this bug happens. This bug appears for me with Mont St Michel built and not built. It appears first usually when apostles cost around 500 faith, but it might occur earlier or later. Most of the time I run out of promotion options sometime around when apostles cost over 1000 faith.
In the attached save game you can reproduce this bug, if you buy an apostle in Ra-Kedet, end the turn, and then promote the apostle next turn. It should then only have two promotion options.