Minecarts snapping to rails don't instantly update client-side hitbox

Confirmed for

• 1.8.6 It seems like a client side issue. The hitbox is valid as you can for example right click it and will be the same position of the Minecart hitbox. However after about one minute the server seems to realize it as well and "corrects" the hitbox.

This is most problematic for Minecarts riding another entity:

Example command

/summon MinecartCommandBlock ~ ~1 ~ {Command:/setblock ~ ~ ~ glass,Riding:{id:ArmorStand,Riding:{id:FallingSand,Time:1,Block:activator_rail,Riding:{id:FallingSand,Time:1,Block:redstone_block}}}}

This will summon a MinecartCommandBlock riding an ArmorStand riding an Activator Rail riding a Redstone Block. The command of the Minecart is "/setblock ~ ~ ~ glass". You will see that the Minecart executes the command and replaces the Activator Rail with Glass.

This has also strange effects when the minecart is falling onto a rail. See #MC-108595

Confirmed in 1.15.2 and 20w22a.

Can confirm in 1.17.1.

Can confirm in 24w04a:

Considering that redstonehelper has been inactive since 2018, it if would be helpful I can take over maintaining this issue.

Fixed in the 24w34a experimental minecart snapshot.