The bug
A boat will glitch / sink through blocks when it falls onto shallow water (see screenshot for setup to reproduce glitch or 3 Glitches with Boats- 1.12 Vanilla Survival)
How to reproduce
Grab a boat
Create setup shown in screenshot
Speed up using 'W' and move towards the waterfall. once you fall on the floor below, you will sink/glitch through the ground, as shown in the video here: https://www.youtube.com/watch?v=Q8mtxsNCOAE
Code analysis
Based on 1.12.2 decompiled using MCP 9.40
It appears the call to Entity.setPosition(double, double, double) in the method net.minecraft.entity.item.EntityBoat.updateMotion() is causing this:
if (this.previousStatus == EntityBoat.Status.IN_AIR && this.status != EntityBoat.Status.IN_AIR && this.status != EntityBoat.Status.ON_LAND)
{
this.waterLevel = this.getEntityBoundingBox().minY + (double)this.height;
// The following line appears to be causing the bug
this.setPosition(this.posX, (double)(this.getWaterLevelAbove() - this.height) + 0.101D, this.posZ);
this.motionY = 0.0D;
this.lastYd = 0.0D;
this.status = EntityBoat.Status.IN_WATER;
}It is unknown if leaving this out solves this bug without causing any other problems.
Linked issues
is duplicated by
MC-96382
Boat sinking into ground from water_bucket flow
MC-104599
Boats Fall Through The Floor
MC-128546
boat glitch when going too fast
MC-151870
Boats can clip through blocks when falling into flowing-water
MC-177486
boats glitch in the ground when falling into flowing water
MC-197353
Boat slid into ground after dismounting
MC-201953
Boats can fall through blocks when pushed into flowing water
MC-214961
Boat falls through the floor on certain turns
MC-215403
The player sunk into the ground while boating in a cave
MC-222097
sinking boat
MC-226801
Sometimes riding a boat in flowing water causes you to get stuck in blocks for a moment
MC-229766
Boat sinks through blocks
MC-230069
Boat getting stuck
MC-234154
Boat able to phase through blocks
MC-244101
Boat when placed on water went into the ground
MC-246979
cats in boat in flowing water descend into block below and suffocate
MC-249024
Boat disappears when on water above soul sand
MC-251769
Boat Sinks in falling flowing water
MC-252322
Boats clip through blocks
MC-252746
Sinking through block when on a boat
MC-253700
the boat gets stuck in blocks
MC-253981
Glitch with boat and flowing water
MC-254233
Oak Boat with Chest sinks under the water while you are on fire.
MC-256565
Bamboo Raft Clipping through blocks under flowing water stream
MC-256676
New bug in 1.19.3 snapshot
MC-257274
Boats move through solid floor if falling onto shallow water
MC-257568
Boat adios in 13 cm deep water (falls through blocks)
MC-258764
Boats become unable to move and will sink into the ground if you drive it from plane of water. It will not sink into the ground untill you leave the boat.
MC-263380
The boat sinks when it encounters downward flowing water and cannot be ridden
MC-263572
boat glitch in ground
MC-264435
Boats go thru floor
MC-266381
The ship got stuck in the soil
Attachments
Comments
AgentM
Tell me what the issue was for reproducing it @FVbico
Were you in the latest snapshot.
Try going at full speed and use F5 mode for optimal setup. (Reference the video if needed)
I was and I was, it just didn't happen to me
I was able to reproduce it. (16w04a)
1. Launch the boat off the upper level of water.
2. Keep holding “W” until landing in the lower flowing water.
Was able to reproduce in this video: https://www.youtube.com/watch?v=4FNCWE3xgL4
Can confirm for 1.11
I don't seem to be able to reproduce in 1.13.1; instead of sinking through the floor, the boat glitches above the water flow repeatedly.
Surprisingly, I can reproduce now! Confirmed for 1.14.
j_p_smith
Confirmed in 1.16.1.
Avoma
Can confirm in 20w48a.
Avoma
Can confirm in 21w05b.
Nassim Jahnke
Still an issue in 1.17.1. As already stated, the issue stems from the following call in Boat#floatBoat
this.setPos(this.getX(), (double) (this.getWaterLevelAbove() - this.getBbHeight()) + 0.101D, this.getZ());where you get the following values if placing a boat at feet height y=64 for example
getWaterLevelAbove() = 64.44444
getBbHeight() = 0.5625
(double) (this.getWaterLevelAbove() - this.getBbHeight()) + 0.101D = 63.98294274902344This video shows where this can also be abused to clip through a bedrock layer, player bases and similar.
Avoma
Can confirm in 1.18.1. It's important to note that this can be reproduced without boats needing to fall from high places into water.
Qcom
This can also be reproduced by placing a boat in the corner of a minimum height flowing water block between heights 8 to 63.
[media]Can confirm the bug is still in 1.19 prerelease3
Can confirm in 1.19-rc2
Avoma
Can confirm in 22w42a. This now also affects bamboo rafts.
Avoma
Can confirm in 1.19.2.
Lunarian
Can confirm in 1.20.1 per MC-263572.
Ellivers
Can confirm in 1.20.4.
can't believe this bug is 8 years old
cannot confirm