Locally-created models stream out and never come back

Bug Reports Engine Bugs
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#1

Issue: StreamingEnabled is streaming out locally-created models

Expected behavior

Expected Behavior: Locally created models should never stream out.

Reproduction steps:

  • Create a new place with StreamingEnabled on default settings
  • Create / insert a model (such as a house)
  • Use a localscript to clone this model, and parent it to the local workspace
  • Model will stream out when you walk far away
  • Model never streams back in (it shouldn’t stream out to begin with, though)
5 Likes
#2

Hello AbstractAlex.

I have not been able to reproduce the issue following the steps as written. Would it be possible for you to provide a place file which demonstrates the problem?

Thank you.

1 Like
#3

Can you please upload the repro you tried that didn’t work?

Curious what the difference would be…

2 Likes
#4

CloneHouse.rbxl (85.9 KB)

Here’s a simple file. There’s a UI button which will locally clone the house and parent it under the workspace.

When you move away, the replicated house will stream out, but not the locally cloned one. Upon moving back, the replicated house streams back in. The locally cloned one should remain present throughout.

Note that as you move away, the locally cloned house might stop rendering at some distance, but you can verify it is still present by examining the workspace.

2 Likes
#5

Hey, I work with Alex. I just reproduced the issue his OP is running into.

Your repro conditions are much different than ours.

In the following video:

These are our current streaming settings.

Screenshot 2025-02-28 at 4.29.02 PM
Screenshot 2025-02-28 at 4.29.02 PM924×358 66.4 KB

The work around presented in the video was simply to set the models to be persistent, which of course is not the solution we’re looking for.

Edit: I can give a simple repro a bit later tonight, that should help with the fix

#6

Thank you for providing your repro. The reason I asked is we had some devices reproducing the issue and others weren’t, so I wanted to try yours to see if this was consistent. It was not.

The issue seems to just reproduce randomly, however I have a place with a high occurrence rate.

In this video:

  • The roads are on the server.
  • The segment near me is streaming in/out for no reason.
  • The cars are client models. “Default” streaming
  • They follow the glowing dots. Glowing dots without a car mean the car streamed out.
  • Lighting is behaving super strange?

I have DM’d you this place, as it’s the most minimal repro of this issue we currently have. I usually need to test it online, as it does not reproduce in studio (but @Usering 's large repro does work in studio)

Sometimes it starts immediately (as in this video) but other times I have to wait a minute or two for the bug to start happening.

#7

Please do. There is still some element we are missing; even after adjusting my test case to be more similar to your based on my observations from your post and video, I have not been able to reproduce the issue.

I made these changes to more closely match your description/video:

  • Changed ModelStreamingBehavior to Improved
  • Moved the source model to ReplicatedStorage
  • Changed the source model’s ModelStreamingMode to Atomic
  • Parented the model under a folder which was under the workspace.

We would not normally expect a locally created instance to be streamed out. If it were parented under a replicated instance which is subject to streaming it could be (and would not be streamed back in), but it does not appear based on the video that you are doing this.

#8

Thank you, we will examine the place you’ve provided and see what issues we can find.

1 Like
#9

After working with AbstractAlex and Usering in a private thread, we determined that the model being streamed out was actually not a locally cloned model, but had been locally reparented by the client from ReplicatedStorage to the workspace.

We discourage use of that pattern, as it creates a desync between server and client state, which can lead to issues such as this.

#10

For the example provided by @Usering that could be the case since it reproduces consistently in studio as well.

But for my traffic cars, they are definitely cloned by the client because only one original exists.
image

But upon joining the game (only reproduces online), they still disappear (and parts of the map repeatedly stream in/out as well?)

#11

I don’t think what the car videos is showing is stream out, but rendering issues. There are some weird things going on with rendering it looks like, with the other lighting issues and flickering objects.

This is what it would look like if there was actual stream out:

image
image1578×610 33.9 KB

The cars would be falling down, driving on the baseplate. In all the videos I’ve seen it appears the cars are continuing to drive at the height of the road, so it seems like the road is there but isn’t being rendered.

So based on the videos it looks like a rendering problem to me, not a situation were parts are being streamed out.

#12

I actually experience reparented models dissapearing without streaming enabled.

I have a dummy in server storage, clone it, parent it to a character’s ScreenGui so no other player will see it, locally parent it to workspace so a local player can see the dummy, and use the dummy for displaying what character the user has selected.

The character selection area is far from the spawn and returning to the character selection screen does not display the dummy.

The reason this is cloned on the server is because i had issues with client-created humanoids like not always displaying accessories well. Reparenting like this is necessary so the dummy isn’t replicated to every client. Unfortunately there is no official way of making objects on the server appear on one client.