Error when customizing the synthetization of the stack

Hello

I have a stack that is deployed with a [customize synthetizer](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.DefaultStackSynthesizer.html). Especially, I am customizing the property`bucketPrefix`. I am basically adding a custom prefix to all assets uploaded.
While synthesizing, I get the error:
```

..../node_modules/cdk-pipelines-github/src/pipeline.ts:491
throw new Error(`Template asset hash ${hash} not found.`);
```

I have the feeling that the local asset path is not defined correctly.
Do you know if there is a workaround ?

Thank you for your help