Both, console.trace and throw new Error don't show the stack-trace beyond the point p-map got called. In other words, the functions that called before pMap, disappear from the stack trace.
As a comparison, the p-map-series doesn't suffer from this issue. It does keep the stack-trace.

See the example below, if you run a function that runs the native Promise.all, the stack trace shows the function name - runPromiseNative. Same if you run the function runPromisePmapSeries. However, try to run runPromisePmap, and you'll see how the stack trace truncated.

I tried node v12.x and v14.x.

const pMap = require('p-map');

const pMapSeries = require('p-map-series');

async function promiseFn() {
  throw new Error('stop')
}

async function runPromiseNative() {
  await Promise.all([promiseFn()]).then(() => { console.log('completed') }).catch((err) => console.error(err));
}

async function runPromisePmap() {
  await pMap([promiseFn], fn => fn()).then(() => { console.log('completed') }).catch((err) => console.error(err));
}

async function runPromisePmapSeries() {
  await pMapSeries([promiseFn], fn => fn()).then(() => { console.log('completed') }).catch((err) => console.error(err));
}

// runPromiseNative();

runPromisePmap();

// runPromisePmapSeries();

Results when running runPromisePmap :

Error: stop
    at promiseFn (/Users/davidfirst/teambit/bit/pmap.js:6:9)
    at /Users/davidfirst/teambit/bit/pmap.js:14:33
    at /Users/davidfirst/teambit/bit/node_modules/p-map/index.js:57:28

Results when running runPromiseNative.

Error: stop
    at promiseFn (/Users/davidfirst/teambit/bit/pmap.js:6:9)
    at runPromiseNative (/Users/davidfirst/teambit/bit/pmap.js:10:22)
    at Object.<anonymous> (/Users/davidfirst/teambit/bit/pmap.js:21:1)
    at Module._compile (internal/modules/cjs/loader.js:999:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1027:10)
    at Module.load (internal/modules/cjs/loader.js:863:32)
    at Function.Module._load (internal/modules/cjs/loader.js:708:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:60:12)
    at internal/main/run_main_module.js:17:47