[3.8.2] When the sprite component renders a texture from RenderTexture, it cannot perform merged rendering. Merged rendering can only be achieved after using a custom material

[zhefengzhang]

Cocos Creator version

3.8.2

System information

All

Issue description

When a new material resource is created using the builtin-sprite shader and this material is set as the custom material for the sprite component, merged rendering can be achieved.

Relevant error log output

Steps to reproduce

Minimal reproduction project

NewProject.zip