In other news.. I've got a few helm executions in my code, and of course I hadn't run it for a long stint while I added stuff - now I hit this issue, getting a whole bunch of these:

unhandled rejection: CONTEXT(1168): Invoking function: tok=kubernetes:helm:template asynchronously
STACK_TRACE:
Error
    at Object.debuggablePromise (c:\<path>\node_modules\@pulumi\pulumi\runtime\debuggable.js:69:75)
    at c:\<path>\node_modules\@pulumi\pulumi\runtime\invoke.js:126:45
    at Generator.next (<anonymous>)
    at fulfilled (c:\<path>\node_modules\@pulumi\pulumi\runtime\invoke.js:18:58)
    at processTicksAndRejections (node:internal/process/task_queues:94:5)

Searching around has shown similar messages when helm is unable to output something - but there is no error message outside of this. Also - this is on the stack.preview() step (using automation) edit: grmbl.. may have found the culprit - by going through each helm resource one by one and making sure its the only one commented out, I finally got a proper error message. So strange that I otherwise only get a bunch of these and otherwise nothing else..