Matcha

For more details of how I experimented with the bugs.

First I set some small fenced pen up for the test subject which in this case is sheep.

I name tag one of them and breed the 2.

Then, I go out and unload them. Approximately 180 blocks is the distance of my travel (tested in my survival world)

I returned and only the name tagged sheep stayed. Not even the babies.

I then experimented with vehicle and found out the same thing.

This is just the speculation for the bugs but I think it’s a problem regarding time of being unload that effect the entity as I tried testing in my testing world where I have flight speed. Unloading them for 2 minutes doesn’t do anything. However, after bumping that to 5 the entity disappear which is what I’d speculated.

I’ve done lots of testing regarding entities persistency and found out a behavior for mobs.

Using debug entities addons, I was able to get the data for entities’ ID and furthermore testing concluded that entities disappear one by one in order of creation from oldest to latest.

This also affects vehicle such as boats and mine carts as well. However, with more testing, I found that name tag prevents the entity from disappearing which is to be expected. However, other method such as breeding does not.

Putting entities inside of vehicle also prevents the despawn of both entities.

Lastly, projectile (mostly tridents and arrows) disappears after being use for a while. Example being thrown trident disappears completely after 2 minutes on ground. The same goes for arrows as well.