Commandblock Minecarts, that contain a space in the command can't be summoned.
Example: /summon commandblock_minecart ~ ~1 ~ {Command:say hi}
Result: Data tag parsing failed: Expected '}' but got 'h' at: {Command:say h<--[HERE]
Works fine in 17w06a
Linked issues
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However, this issue has been closed as a Duplicate of MC-116410.
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Can confirm for 17w16b in Windows 10 w/ Java 8, but only occurs when specifying coordinates. (IE: /summon commandblock_minecart {command:say hi} functions properly.)