Model starts sharp in Android Scene Viewer, then becomes blurry at the bottom after ~1 second #5203

Description:
When I open my GLB in AR on Android (Scene Viewer), the model looks sharp for about one second, then the bottom part becomes blurry with a soft shadow. Turning "object blending" OFF removes the blur, but the model then looks like it is floating.

Another store's model on the same phone stays sharp, so I think something differs on my side, but I can't tell what.

Details:

• Device / Android version: [Tecno Comon 40]
• Chrome version: [153.0.8010.49]
• How it's used: Shopify product page ( from the theme)
• GLB: under 1 MB, 1K textures, bottom at Z = 0, no ground plane or baked shadow

Questions:

1. What could make the bottom blur once the floor is detected?
2. Is there a model or attribute setting (ar-placement, scale, materials) to avoid it?

screenshot attached