The toolchain editor generates invalid toolchains

• Let say that you have 3 blocks A, B and C. The block A is a dataset block and the blocks B and C are regular blocks. When you create a connection between blocks A and B, the connection uses the synchronization channel from A. Right after that, when you try to create a connection between the blocks A and C (using the same field on the "A" side), the synchronization channel is null, which invalidates the toolchain. Additionally, it is not possible to fix it.

• In the same example as above (blocks A,B and C), when you create a connection between the blocks A and B, it is not possible to create a connection between A and C (using the same field in the "A" side). The only possible way is to create a connection between C and A. I know this is the same thing, but it is not intuitive.