The ship was not sealed with beeswax alone.
Known. One repair mix used pine tar and beeswax.
The wreck is Ilovik-Paržine 1, off the island of Ilovik, in Croatia. It is 2,200 years old, from the mid-second century BC. It lay about four metres under the sea. The cargo was timber logs and amphorae. Most of the coating was pitch, made from heated conifer resin. One sample mixed pine tar with beeswax. Pollen in the coatings points to four or five repair times. Some coatings match southern Italy, near Brindisi. Others match the north-east Adriatic, near where the ship sank.
The page does not say what is still argued.
https://www.ancient-origins.net/news-history-archaeology/roman-shipwreck-croatia-00102734