I recently started a new 1.15.2 modded survival and I encountered a problem with the seeder.
I wanted to plant potatoes/carrots but I found out that only seeds will go into the seeder.
It always worked on the 1.12.2 version of the mod so hopefully it can be fixed! :)

Btw, I'm using the newest version of the mod (0.44.1)

Update on the issue.

It's been a while since I discovered & reported this "issue" so I decided to take a look at different versions of the mod.

Vehicle mod 1.12.2 - 0.44.1

Vehicle mod 1.16.3 - 0.45.1 (newest version)

^This is also the case on the 1.14.4 and, ofcourse, the 1.15.2 version of the vehicle mod.

I don't know if this is done intentional or if this is a bug.