Please state in which country your phrase tends to be used, what the phrase is, and what it should be.
Example:
In America, recently came across “back-petal”, instead of back-pedal. Also, still hearing “for all intensive purposes” instead of “for all intents and purposes”.
That’s a dialectal difference, not an error.
Not when written
It’s very much not recommended, and generally seen as an error. But this article puts an asterisk on it.
https://www.merriam-webster.com/grammar/whats-worse-than-coulda