How to debug minified code bug

[matart15]

My yarn start works without problem.
But yarn build && nxp serve -s build gives error.

Uncaught TypeError: Cannot read properties of undefined (reading 'call')
    at s (mysite.com/:1:1360)

If I look at that code, it's all minified. I have no idea what went wrong.

I cleared cache and everything. same result.

Same issue was there but gi got closed.

So, How do I debug when yarn start works and yarn build does not?