There have been several major instances where the media fact-checks a claim as false, only for evidence to later show that it was true from the beginning. In some cases, the media has had to issue corrections as a result, or at least acknowledge the updated evidence.
The repeated mistakes appear to favor the Democratic narrative, which may be why a Trafalgar poll from December found that 76.3% of Americans believe the mainstream media's primary focus is on advancing its own political agenda.
Last October, Gallup found that just 36% of Americans trust the media, the second-lowest reading on record, with the worst being 32% in 2016.