(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.
Linked issues
Attachments
Comments 1
MC-149145
Minecart won't push off of redstone block
Resolved
Duplicate
0
_FallenTurtle_
(Unassigned)
Unconfirmed
(Unassigned)
Minecraft 1.14
Retrieved
Duplicate of MC-6311