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Fixed

Fixed in 6.0.9

Votes

10

Found in [Package]

6.0.8

Issue ID

PBLD-279

Regression

Yes

“The type Unity.ProBuilder UnityEngine.ProBuilder.Shapes.Cube is being serialized by [SerializeReference], but is missing the [Serializable] attribute…” warning is thrown after creating Probuilder GameObject

Package: Probuilder

-

Reproduction steps:
1. Create a new project
2. Install Probuilder package
3. Create any Probuilder GameObject in Hierarchy (e.g. GameObject > Probuilder > Arch)
4. Observe the Console

Actual result: “The type Unity.ProBuilder UnityEngine.ProBuilder.Shapes.Cube is being serialized by [SerializeReference], but is missing the [Serializable] attribute. To suppress this warning add [Serializable] or use [MakeSerializable].” warning is thrown
Expected result: No errors or warnings are thrown

Reproducible with: 6.0.6 (6000.3.0a5 (f9a1fab5607a)), 6.0.8 (6000.3.0a5 (f9a1fab5607a), 6000.3.0f1, 6000.4.0a5, 6000.5.0a2)
Not reproducible with: 6.0.8 (6000.0.63f1, 6000.2.13f1, 6000.3.0a4)

Reproduced on: macOS Tahoe 26.1 (M4)

Note: FAV is in Editor versions
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Comments (5)

  1. glynnsmith

    Feb 04, 2026 06:52

    Hey. Also seeing this issue in v6.3LTS (6000.3.5f2, and 6000.3.6f1). Same reproduction steps as in the OP issue report.

    Definitely not a blocking issue, but I don't want to be ignoring or hiding warnings in the console :)

    Cheers!

  2. Shabazza

    Dec 27, 2025 00:02

    Same here. After update to unity 6.3 LTS from 6.2, I get those warnings for any 3D shapes made with proBuilder 6.0.8.
    Seems to be in the auto-generated code.

  3. Baxayaun

    Dec 11, 2025 18:32

    OMG, you're actually right! I convinced myself that this was an error, but it was, indeed, a warning. Then I checked when this warning was appearing because I thought it appeared when I tried to activate the ProBuilder Edit Mode, which I thought was not visible because of the warning... but no, what happened is that the Edit Mode button moved again to another place in this version! 🤣

    So yeah, now I can see that my problem was that I didn't know had to left click the cube icon at the top of the floating Tools Menu to reveal that there are two modes in there: Game Object and ProBuilder. Before, that Edit Mode for ProBuilder was always exposed, but now is hidden!

    Well, I appreciate your answer, otherwise I wouldn't have doubted of myself, but I wonder if there are more people out there who thinks that after the update not seeing the Edit Mode button (the yellow one) where it was before is a bug.

    Anyways, thank you!

  4. Mat_Anim

    Dec 11, 2025 16:07

    Hello, while there is a fix in progress, I cannot give a timeline as to when probuilder 6.0.9 will land, as 6.0.8 was released recently.

    Just wondering though, is this really a blocking issue? Can't the warning simply be ignored? I'm curious about use cases where it worked in 6000.1, and it's not working in 6000.3 (apart from simply having a warning logged).

    Thanks!

  5. Baxayaun

    Dec 10, 2025 11:29

    I started having this issue after updating Unity from 6000.1 to 6.3 LTS (Windows 10, latest ProBuilder version)

    I'm kinda worried because I cannot continue my project level design wise. I need to create new pieces of a modular set and this is preventing me from doing it. I really don't know how long it usually takes for a bug to be solved, but I've seen some that take even months. Is this going to be the case? Otherwise I can just work on those pieces in a different version of the Editor and export them to the one where the issue is active.

    Anyway, thanks for your effort! I really love ProBuilder. ❤

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