when I do pulumi up it just gets stuck in previewing, I tried -v=3, --skip-preview (it gets stuck in updating), --tracing. Any other way to debug this? Integration tests are stuck in a similar way.

Try

-v=9 --debug

and provide us the output

It's primitive, but I've bisected and removed code in the past. Pulumi scripts are very fragile at times. Especially when you mess up applys.