Unable to add the requested character to font asset [modioSans_JP_Regular SDF]'s atlas texture

[Laumania]

I get a lot of these as soon as mod.io UI is shown.

Just upgraded to v2026.5.1 and get these warnings when I start my game in Unity.

I'm using Unity 6000.3.11f1.

Unable to add the requested character to font asset [modioSans_JP_Regular SDF]'s atlas texture. Please make the texture [modioSans_JP_Regular SDF Atlas] readable.
UnityEngine.Debug:LogWarning (object,UnityEngine.Object)
TMPro.TMP_FontAsset:TryAddCharacterInternal (uint,TMPro.TMP_Character&) (at ./Library/PackageCache/com.unity.ugui@f17df9b1ab21/Runtime/TMP/TMP_FontAsset.cs:2604)
TMPro.TMP_FontAssetUtilities:GetCharacterFromFontAsset_Internal (uint,TMPro.TMP_FontAsset,bool,TMPro.FontStyles,TMPro.FontWeight,bool&) (at ./Library/PackageCache/com.unity.ugui@f17df9b1ab21/Runtime/TMP/TMP_FontAssetUtilities.cs:172)
TMPro.TMP_FontAssetUtilities:SearchFallbacksForCharacter (uint,TMPro.TMP_FontAsset,TMPro.FontStyles,TMPro.FontWeight,bool&) (at ./Library/PackageCache/com.unity.ugui@f17df9b1ab21/Runtime/TMP/TMP_FontAssetUtilities.cs:207)
TMPro.TMP_FontAssetUtilities:GetCharacterFromFontAsset_Internal (uint,TMPro.TMP_FontAsset,bool,TMPro.FontStyles,TMPro.FontWeight,bool&) (at ./Library/PackageCache/com.unity.ugui@f17df9b1ab21/Runtime/TMP/TMP_FontAssetUtilities.cs:178)
TMPro.TMP_FontAssetUtilities:GetCharacterFromFontAsset (uint,TMPro.TMP_FontAsset,bool,TMPro.FontStyles,TMPro.FontWeight,bool&) (at ./Library/PackageCache/com.unity.ugui@f17df9b1ab21/Runtime/TMP/TMP_FontAssetUtilities.cs:57)
TMPro.TextMeshProUGUI:SetArraySizes (TMPro.TMP_Text/TextProcessingElement[]) (at ./Library/PackageCache/com.unity.ugui@f17df9b1ab21/Runtime/TMP/TextMeshProUGUI.cs:1976)
TMPro.TMP_Text:ParseInputText () (at ./Library/PackageCache/com.unity.ugui@f17df9b1ab21/Runtime/TMP/TMP_Text.cs:2044)
TMPro.TMP_Text:GetPreferredWidth () (at ./Library/PackageCache/com.unity.ugui@f17df9b1ab21/Runtime/TMP/TMP_Text.cs:3695)
TMPro.TMP_Text:get_preferredWidth () (at ./Library/PackageCache/com.unity.ugui@f17df9b1ab21/Runtime/TMP/TMP_Text.cs:1507)
UnityEngine.Canvas:SendWillRenderCanvases ()

[Laumania]

AI helped fix it locally, for me, hope you fix it in the actual SDK:

Root cause: mod.io ships six modioSans TMP fallback fonts for CJK/Thai/Arabic, all set to Dynamic atlas population (glyphs get baked into the atlas at runtime as needed). A dynamic atlas requires its texture to be CPU-readable so TMP can write new glyphs into it — but two of the six (modioSans_JP_Regular SDF and modioSans_TC_Regular SDF) were serialized with m_IsReadable: 0, while the other four correctly ship with 1. So whenever the Workshop shows a mod name containing a Japanese or Traditional-Chinese character that isn't already pre-baked, TMP hits that exact check (TMP_FontAsset.cs:2604), logs the warning, and the character renders as a missing glyph.
What I changed:
Flipped m_IsReadable: 0 → 1 in modioSans_JP_Regular SDF.asset and modioSans_TC_Regular SDF.asset — the exact change the TMP inspector itself writes, and the diff is exactly 2 lines total. I then forced a reimport in your running editor and verified both now report populationMode=Dynamic, atlas readable=True.
Added a Gotchas entry to play-testing-via-mcp.md documenting this, because the assets live in the vendored plugin folder — the next mod.io SDK upgrade will silently revert this. The note includes the re-check recipe (grep the ModioSans folder for m_IsReadable: 0 after upgrading).