TNT falls through fences and walls when ignited whilst on top of them

The Bug:

TNT falls through fences and walls when ignited whilst on top of them.

Steps to Reproduce:

1. Build the setup as shown in the attachment below. setup.png
2. Ignite both of the TNT blocks and watch them closely.
3. Take note as to whether or not TNT falls through fences and walls when ignited whilst on top of them.

Observed Behavior:

TNT falls through fences and walls when ignited whilst on top of them.

Expected Behavior:

TNT would not fall through fences and walls when ignited whilst on top of them.

Code Analysis:

The following is based on names using yarn (20w06a).

As said above, the TNT hops, but because of the fence being 1.5 blocks high, the TNT hops into the fence's hitbox and as result falls through. The "hop" has a motionY (vertical motion) of 0.20000000298023224 in the net.minecraft.entity.TntEntity.TntEntity initial method. This vertical motion is not enough to get on top of the fence/wall's hitbox. A suggested value would be; 0.22649273522D. Changing this initial value has very little impact to no impact (from 6 pixel high jump to 8 pixels jump, roughly).

As mentioned above already; change the initial motion (setVelocity) to: 0.22649273522.

this.setVelocity(-Math.sin(double10) * 0.02, 0.22649273522, -Math.cos(double10) * 0.02);