Amplify hosting production builds work, but not previews

App ARN arn:aws:amplify:us-east-1:568579195889:apps/d3ulmammbfkz6s

I've attached the build logs from the preview - it's complaining about a missing NPM package (which is definitely defined in the package.json). The production build was able to successfully install it and build the app. The preview however couldn't.

I'm hosting a Nextjs app (with SSR) in a turborepo monorepo using npm workspaces.

                                 # Starting phase: preBuild
2023-03-29T07:11:45.431Z [INFO]: # Executing command: npx npm install
2023-03-29T07:11:57.111Z [INFO]: added 346 packages, and audited 355 packages in 11s
2023-03-29T07:11:57.117Z [INFO]: 96 packages are looking for funding
                                 run `npm fund` for details
                                 1 moderate severity vulnerability
                                 To address all issues, run:
                                 npm audit fix
                                 Run `npm audit` for details.
2023-03-29T07:11:57.141Z [INFO]: # Completed phase: preBuild
                                 # Starting phase: build
                                 # Executing command: npx turbo run build --filter=blender
2023-03-29T07:11:58.010Z [WARNING]: npm
2023-03-29T07:11:58.011Z [WARNING]: WARN exec The following package was not found and will be installed: turbo@1.8.6
2023-03-29T07:11:59.065Z [INFO]: • Packages in scope: blender
                                 • Running build in 1 packages
                                 • Remote caching disabled
2023-03-29T07:11:59.065Z [INFO]: types:build: cache miss, executing a9da055a7c02e257
2023-03-29T07:11:59.401Z [INFO]: types:build:
                                 types:build: > types@1.0.0 build
                                 types:build: > tsc
                                 types:build:
2023-03-29T07:12:00.287Z [INFO]: types:build: src/types/request.ts(1,27): error TS2307: Cannot find module 'firebase/firestore' or its corresponding type declarations.
2023-03-29T07:12:00.289Z [INFO]: types:build: src/types/user.ts(1,27): error TS2307: Cannot find module 'firebase/firestore' or its corresponding type declarations.
2023-03-29T07:12:00.295Z [INFO]: types:build: npm ERR! Lifecycle script `build` failed with error:
                                 types:build: npm ERR! Error: command failed
2023-03-29T07:12:00.295Z [INFO]: types:build: npm ERR!   in workspace: types@1.0.0
                                 types:build: npm ERR!   at location: /codebuild/output/src974571710/src/apps/packages/types
2023-03-29T07:12:00.300Z [WARNING]: types:build: ERROR: command finished with error: command (/codebuild/output/src974571710/src/apps/packages/types) npm run build exited (1)
2023-03-29T07:12:00.300Z [WARNING]: command (/codebuild/output/src974571710/src/apps/packages/types) npm run build exited (1)
                                    ERROR  run failed: command  exited (1)
2023-03-29T07:12:00.301Z [INFO]: Tasks:    0 successful, 1 total
                                 Cached:    0 cached, 1 total
                                 Time:    1.637s
2023-03-29T07:12:00.311Z [ERROR]: !!! Build failed
2023-03-29T07:12:00.311Z [INFO]: Please check the supported SSR features to find if your build failure is related to an unsupported feature: https://docs.aws.amazon.com/amplify/latest/userguide/ssr-Amplify-support.html#supported-unsupported-features. You may also find this troubleshooting guide useful: https://docs.aws.amazon.com/amplify/latest/userguide/troubleshooting-ssr-deployment.html
2023-03-29T07:12:00.312Z [ERROR]: !!! Non-Zero Exit Code detected
2023-03-29T07:12:00.312Z [INFO]: # Starting environment caching...
2023-03-29T07:12:00.312Z [INFO]: # Environment caching completed
Terminating logging...