As UK, when I order a naval transport of medium or heavy tank divisions from UK (I tried to depart from both Plymouth and Belfast) to e.g. Gibraltar, the transport starts and the tanks go out to sea. However, in the Bay of Biscay (or at a similar distance if departing from Belfast), the transport order is automatically cancelled, the division stops while a red "out-of-supply" symbol is shown on the division icon. After a few seconds, the transport heads back to my closest port, which is Plymouth. This makes it impossible for me to move tanks out of UK. The same thing happens if I do a naval invasion.
Why could this be? Is it a bug or should it not be possible to transport medium and heavy tanks long distances? I have enough 426 convoys available, so I suppose that's not the problem.
Below is an image showing the tank division before the moment it turns back to Plymouth (after departing from Belfast).
Why could this be? Is it a bug or should it not be possible to transport medium and heavy tanks long distances? I have enough 426 convoys available, so I suppose that's not the problem.
Below is an image showing the tank division before the moment it turns back to Plymouth (after departing from Belfast).

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