snapshot 17w50a has a bug with the conditional chain command blocks

When I have a command block that runs the following command:
scoreboard players set @a Timer 0
and a chain command after it set to conditional and always active and the command:
setblock ~ ~ ~-2 redstone_block
The setblock does not run. I have tried making the command uncoditional and it works, but I need it to be conditional otherwise it won't work. It worked just fine in 1.12 but stopped working now.