Duplicating TNT works again in 1.13-pre3
TNT duplication was patched in previous pre-releases, but it has for some odd reason become possible to do again. A flying machine as one built on Image 1 will, when moving forward, ignite the TNT, while the TNT block also remains, causing the formation of two TNT. When flying forward, this flying machine will create many TNT, as shown on Image 2. This bug severely affects game play and should be made sure to be fixed before actual release rolls out.