See Paul’s first person account in 1 Corinthians 15 and his description of the resurrection appearance to him as a vision in Acts 26:19. 1 Corinthians (written AD 53–54) is the earliest account in the Bible of the resurrection appearances. The gospels were written years later.
One can plausibly argue that the later gospel writers either inherited an embellished account from their sources or they themselves physicalised the earlier visionary stories to impress their readers. The early Christian accounts are peppered with myth and legend.
The zombie apocalypse is my favourite: