It wasn't an issue so much, but just something you'd hear every once in a while from Star Wars fans. "He says parsecs, but parsecs is a measure of distance and not speed. They messed up that in the script - here's an explanation that actually makes sense, it's my head canon"

Then when Solo came out all those talking points got thrown out, since that "head canon" became actual canon

That's how I remember all of this going down at least.