Can you please provide which APIs exactly should be bridged?

Forge's getModelData and getQuads does not default to Fabric emitBlockQuads and vice versa
For example, Continuity only uses emitBlockQuads and calls emitBlockQuads on the wrapped model. If the wrapped model is a Forge model that uses getQuads + getModelData, the emitBlockQuads call on the wrapped model will not work well. The other way around also applies, for example if a Forge model wraps a Fabric model.

Pepper