I noticed that chain command blocks weren't working so I created a simple test, a chain that should say 1 2 3 4 however only the impulse block activates, the chain blocks are set to always active
The chain command blocks need to be conditional.
This I said when I thought chain command blocks didnt work unless they were conditional LOL
Shouldn't have to be conditional but that's good to test.
I would also try running this test in a different location.
Hopefully it's just a bug with 1.13