This happened yesterday. After playing a bit today and trying again, I correctly learned Wave of Force (with the incorrect Slowfall message as described in #75118)

I did not update the game or change anything else

That's odd--I wonder if the power name string didn't get passed through the EoC properly?

I think I figured it out.

When you don't have the spell in question, the recipe EOCs like EOC_PRACTICE_TELEKIN_ENHANCE_STRENGTH queue the learning EOC, e.g. EOC_PRACTICE_TELEKIN_ENHANCE_STRENGTH_LEARNING, some time in the future.

When EOC_PRACTICE_TELEKIN_ENHANCE_STRENGTH_LEARNING fires, it checks that you have effect_psi_learning_new_power, meaning you're currently meditating to learn a new power.

But there's no check for which power you're trying to learn. So if you craft the Enhance Strength recipe and queue up the ES learning EOC, then cancel the meditation and craft the Wave of Force recipe instead, when EOC_PRACTICE_TELEKIN_ENHANCE_STRENGTH_LEARNING eventually fires it'll see that you have effect_psi_learning_new_power and roll the learning check as usual, even though you're nominally learning a different power.

I think this means it's possible to maximize your odds of learning a power quickly by starting and cancelling the meditation repeatedly, as well as to meditate on learning several different powers at once in the same way. And it's pretty likely to happen on accident, because it occurs any time you cancel and restart the learning meditation for any reason.

This is what happens with my playstyle (I never grind and mostly only try to learn one power at a time). I don't experience these errors.

The latest power is passed through as a string_var, so if there's a way to check that it's easy to fix--just make sure the learning EoC only fires if the string_var matches the most-recently studied power. If there's not a way to check that I have to either let it sit until there is, or come up with some numeric code system, assign every power a numeric code, and check the code.

Edit: compare_string exists, it'll be an easy (albeit time-consuming) fix

Won't it still be possible to queue the same EOC multiple times, to get lots of rolls and/or more favorable timings?

Won't it still be possible to queue the same EOC multiple times, to get lots of rolls and/or more favorable timings?

That bug is currently unsolvable because there is no way to manipulate EoCs in queue. The only way around that would be to implement some kind of harsh penalty for starting a learning a new power EoC that would penalize all the people not doing silly cancel tricks.

I could easy say "all of your psionics are at 1/3rd effectiveness for a day after you try to learn a new power (and if you cancel/start ten times, well, that's ten days of debuff), but the real way to solve it is a generic power learning EoC with some toggle that says "the latest instance of the EoC with this ID overwrites all previous instances--there can only be one copy running at a time."