Determined to happen in NINTENDO SWITCH and windows10
Trigger method:
1 On flat ground
2 Place slime blocks
3 Place a ship on the slime block

4By boat

I am trying to find out if anyone else has created this report
But bad english
My grammar may be wrong
I don’t understand, suggest to go to the movies
Video :https://youtu.be/-PFt0YA-3Hw

Different platforms have slightly different conditions, but all ships can fly