Turbopack just errors on every page, webpack works fine

[beck24]

I'm not sure how to go about debugging this or even getting any relevant information. We have a large Nextjs project we're upgrading from 14 -> 15. It runs completely fine with next dev, no errors at all.
Running with turbopack just gives 500 errors on every page with nothing relevant in the console.

Output opening home page with webpack:

~/lweb$ ./node_modules/.bin/next dev
   ▲ Next.js 15.2.4
   - Local:        http://localhost:3000
   - Network:      http://172.17.193.16:3000
   - Environments: .env.local
   - Experiments (use with caution):
     ✓ reactCompiler

 ✓ Starting...
 ✓ Ready in 1166ms
 ○ Compiling / ...
 ✓ Compiled / in 4.3s (2787 modules)
 ✓ Compiled in 765ms (1233 modules)
 GET / 200 in 11332ms

Output opening home page with turbopack:

~/web$ NEXT_TURBOPACK_TRACING=1 ./node_modules/.bin/next dev --turbopack
   ▲ Next.js 15.2.4 (Turbopack)
   - Local:        http://localhost:3000
   - Network:      http://172.17.193.16:3000
   - Environments: .env.local
   - Experiments (use with caution):
     · turbo
     ✓ reactCompiler

 ✓ Starting...
 ✓ Ready in 821ms
 ○ Compiling / ...
 ✓ Compiled / in 7.6s
 ○ Compiling /_error ...
 ✓ Compiled /_error in 2.6s
 GET / 500 in 10251ms

Any suggestions as to why this happens or how to go about getting relevant info to debug the issue?