Sometimes your “mistake” results in a big success, or you find out that it actually was the correct way of doing it. I sarcastically call this a “correct mistake”. What do you call it? I don’t know if you can call it a “blessing in disguise”.
good luck that happens by chance, without you planning it at all
or even more incredible, sheer dumb luck:
When something happens by sheer dumb luck, it is considered to have happened unintentionally and without planning.
Also, possibly [a lucky accident]or a fluke:
a stroke of good luck (“Whose run-away horse he had stopped …by the merest fluke,” 1889). ...it seems a small jump from meaning “guess” to “lucky shot" (in billiards), and I’d say that dialect word is almost certainly the source of this kind of “fluke.”
Possibly a reversal of fortune:
an act or instance of reversing; The point at which the action of the plot turns in an unexpected direction for the protagonist.
the occurrence and development of events by chance in a happy or beneficial way
You can consider these phrases that are directly related to mistakes with good outcomes:
- lucky mistake
- fortunate error
- happy fault
There is also a Latin phrase (used in English), felix culpa, which is usually used in religious contexts. Its literal translation is "happy fault".
An apparent error or disaster with happy consequences.
But there seems to be a felix culpa happening here as well.
Felix culpa is a Latin phrase that comes from the words felix (meaning "happy," "lucky," or "blessed") and culpa (meaning "fault" or "fall"), and in the Catholic tradition is most often translated "happy fault," as in the Paschal Vigil Mass Exsultet O felix culpa quae talem et tantum meruit habere redemptorem, "O happy fault that earned for us so great, so glorious a Redeemer."
"Vindication" would be an excellent word to describe that situation of events. On its face, this word may not seem to fit the mold of the questioner's intent, but looking more closely:
Vindication is the noun form of vindicate, coming from the Latin vindicare which has a primary meaning to lay claim to. Whatever your focus in this complex thought:
- the "mistake" of misinterpreting the original act
- the ultimate blessing of the original act
- the process of correcting the mistake
the notion of laying claim to the ultimate blessing of the original act fits the meaning of vindication. What is is called when something you previously took to be a mistake turned out to be the correct decision? VINDICATION!
Vindication may not be the word that the original questioner wants to use, because of the various connotations of vengeance and punishment, but it would be a legitimate use of the word.
In some contexts, a useful adjective might be salutary:
Merriam-Webster: having a good or helpful result especially after something unpleasant has happened
Oxford Dictionaries: (Especially with reference to something unwelcome or unpleasant) producing good effects; beneficial <a salutary reminder of where we came from>
Oxford English Dictionary: 1. Conducive to health; chiefly, serving to promote recovery from disease, or to counteract a deleterious influence. 2. Conducive to well-being; calculated to bring about a more satisfactory condition, or to remedy some evil; beneficial, ‘wholesome’. Often with figurative notion of sense 1. <The French..I look upon to be our natural and salutary enemies. They..hold us in exercise, and keep a quarrelsome people from falling out among themselves.> <The plot which ruined Bohun..produced important and salutary effects.>
I'd describe it as very apropos meaning "very appropriate to a particular situation." An example seems fitting:
I slipped on a banana peel and fell just in time to miss the wrecking ball. How apropos.
Happy accident gets used a lot too as others have mentioned. (Please feel free to correct my usage here--my english isn't all that great.)