Last night I was playing a game of Eldritch Horror where in a particular encounter phase I managed to get the blessed condition. However during the subsequent mythos phase of the same round I had to check for reckoning and immediately lost it again. In Arkham Horror I vaguely remember a rule that you can't lose blessed in the same round you acquire it. I couldn't find any such rule in EH though. I know there's a rule that you don't have to check for reckoning for components that you acquire during reckoning, but I got the blessed condition during the encounter phase.

So is it just bad luck having to resolve a reckoning the phase immediately after you acquire the blessed condition, or is there some rule I missed that prevents this?

About the loss of blessing, I can't remember of any rule that would prevent this.

Now you mention it, I realize I used to resolve reckoning effects on component just acquired on the same reckoning, is this something in the FAQ ?

(EH only, never played AH)

From the EH reference guide, page 9, bottom right:

If a Monster is spawned or an investigator gains a component
while investigators are resolving @ effects, they do not resolve the
@ effect on that Monster or component.

Yeah, there's nothing preventing you from losing a Blessing the round you gained it. And this is true for any Condition you might have: if a reckoning is to be resolved during the Mythos ending the turn you gain the condition, you check the reckoning effects on the cards. In the same way you do this for a Dark Pact or a Debt, you do it for a Blessing. If rules were different, they'd have been vstated on the card.

Once more, Arkham is a different game, with its own set of rules

So there's no rule I missed somewhere; it's just possible to be that unlucky.

Yeah, sadly, it's just bad luck

On the flip side, I've had a round where an investigator gained a cursed condition from an encounter and then lost it during the reckoning. I'd call that good luck!