(I am not sure if this is 1.14 specific) I happened to find that minecarts wont launch off of a redstone block when placed. This is easier shown in this video.
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violine1101
MC-149145
Minecart won't push off of redstone block
Resolved
Duplicate
0
violine1101
_FallenTurtle_
(Unassigned)
Unconfirmed
(Unassigned)
Minecraft 1.14
Retrieved
Duplicate of MC-6311