HD 114762b is listed as the first exoplanet. It was discovered in 1989 but was determined to be a brown dwarf. A paper in 1995 suggested it might be a low mass M-class star companion, rather than the original idea that it might be a brown dwarf.
When did this exoplanet become a planet? Why is it not considered the first planet discovered?
[I could not find this discussion in BAUT.]