Error rendering glTFs with 2-component normals

Before we are using CesiumJS 1.93 and it works, after upgraded to 1.105 it fails, error show in below:

RuntimeError: Fragment shader failed to compile. Compile log: WARNING: 0:2: 'GL_OES_standard_derivatives' : extension is not supported
ERROR: 0:326: 'v_texCoord_0' : undeclared identifier
ERROR: 0:326: '=' : dimension mismatch
ERROR: 0:326: '=' : cannot convert from 'const highp float' to 'highp 2-component vector of float'

Error
at new RuntimeError (http://localhost:8080/Build/CesiumUnminified/index.js:15434:11)
at createAndLinkProgram (http://localhost:8080/Build/CesiumUnminified/index.js:36538:9)
at reinitialize (http://localhost:8080/Build/CesiumUnminified/index.js:36691:19)
at initialize2 (http://localhost:8080/Build/CesiumUnminified/index.js:36686:3)
at ShaderProgram._bind (http://localhost:8080/Build/CesiumUnminified/index.js:36745:3)
at beginDraw (http://localhost:8080/Build/CesiumUnminified/index.js:182260:17)
at Context.draw (http://localhost:8080/Build/CesiumUnminified/index.js:182346:3)
at DrawCommand.execute (http://localhost:8080/Build/CesiumUnminified/index.js:33512:11)
at executeCommand (http://localhost:8080/Build/CesiumUnminified/index.js:231039:52)
at executeCommands2 (http://localhost:8080/Build/CesiumUnminified/index.js:231345:7)

I have tried the latest gltf-pipeline to remove the unsupported extension, but still no hope ...

Extensions of the model which working in 1.93: (named a.gltf)
"CESIUM_RTC",
"WEB3D_quantized_attributes",
"KHR_techniques_webgl"

Extensions of the model after gltf-pipeline: (named b.gltf)
"CESIUM_RTC",
"WEB3D_quantized_attributes"

both a and b glTF having the same error when import to 1.105, and only a.gltf in 1.93 is working.

can anyone please help?

Start by reproducing the shader compilation failure in CesiumJS 1.105 with the supplied a.gltf and b.gltf models, comparing their 2-component normals and listed extensions. Use the reported v_texCoord_0 errors as the initial investigation point; done means both models render without the fragment shader compilation failure.

Written by the indexing model from the issue text.