ViewportFrame doesn't render working MeshPart

Issue Type: Display
Impact: High
Frequency: Constantly
Date First Experienced: 2021-04-14 00:04:00 (-07:00)
Date Last Experienced:

Reproduction Steps:
In Repro.rbxl there is a ViewportFrame at StarterGui.ScreenGui.ViewportFrame, in it there is a MeshPart named “MeshPart” that does not render in studio or in-game, but the MeshPart renders in workspace (included in file). I added a “MeshPartNoId” into the ViewportFrame to show the viewport is working and aligned to see the origin.

Steps:

  1. Look at ViewportFrame in StarterGui.ScreenGui
  2. The bug occurs when the MeshPart named “MeshPart” is not visible in the gui (despite being centered in the camera next to a blank MeshPart).

Removing the MeshId from the MeshPart will make it visible in the ViewportFrame (to ensure camera is aligned).

Repro.rbxl (76.0 KB)

Expected Behavior:
I expect to see the model of the chest that I see in workspace to be visible in the center of the StarterGui.ScreenGui.ViewportFrame

Actual Behavior:
As shown, the MeshPart named “MeshPart” in the ViewportFrame does not render in the ViewportFrame, although it works in workspace.

RobloxStudioBeta_ihq8FdUfop

Workaround:

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I will log this as a bug.
The workaround is to place the MeshPart under Model Instance:

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