If you CTRL (or command on mac) + pick block (default is middle mouse) a command block with the "Conditional" tag active, then place down the block, it will not carry that tag. It does work when the "Always Active" tag is active. I believe the issue is that there is no NBT tag for conditional so there's no info to carry, please add a conditional NBT tag in 1.9.5+.
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Duplicate of MC-87296.