If I put a minecart on unactivated Activator Rails, then I can sit in this minecart and go.
But if Activator Rails is activated, the minecart starts to turn left and right, and I can't sit in it.
Sorry for bad English
Video: https://youtu.be/e_-X_Ym_Uj0
Comments 2
Thank you for your report!
However, this issue is Working as Intended.
As described in the Minecraft Wiki, the purpose of an activator rail is to eject a player or mob riding a minecart, when it's powered.
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This is a confirmed game mechanic that is meant to exist.
The point of the turning is that if a tnt minecart passes over on Activator rails, it will explode.
If a normal minecart with you or... a sheep, for example, passes over a on Activator rail, it shakes and kicks you out.
This is for immediate expulsion, useful for villagers.
The villager will be kicked out of the minecart and you can break it safely without hurting the villager.