"An error occurred while zipping the api artifacts" error trying to use shared library package

I have a node library which is shared between my function API and my client. I can run the static web app, including the API locally, but when I use GitHub actions, I get the following:

```
Zipping Api Artifacts
An error occurred while zipping the api artifacts: Could not find file '/bin/staticsites/-swa-oryx/api/node_modules/titancommon'.
This error may be due to a broken symbolic link. Please review the build logs for any warnings or errors
```
In the GitHub workflow yaml, I have a step which builds the common library, and a step to build the API (it's in typescript), which look like this:
```
- name: Build common Local Package
run: |
cd common
npm install
npm run build

- name: Build service API
run: |
cd service
npm install
npm run build
ls node_modules # output: this DOES include the titancommon library
```

The API's package.json includes the common library as such:

```
"dependencies": {
"titancommon": "file:../common"
```

This seems like a bug, but in the mean-time is there a work-around place to put a file based dependency like this so that it will be properly copied into the API deployment?