[webpack.cache.PackFileCacheStrategy] Caching failed for pack: Error: Can't resolve 'webpack.config.js'

[genyslt]

Have you used AI?

None

Bug Description

After upgrade to "webpack-cli": "7.0.1", i got this error.

webpack-cli --config webpack.config.js - got warning and didnt cache [webpack.cache.PackFileCacheStrategy] Caching failed for pack: Error: Can't resolve 'webpack.config.js'
webpack-cli --config ./webpack.config.js works great

Link to Minimal Reproduction and step to reproduce

const _ = require('lodash');
const cfg = require('./vendor/myvendor/webpack/configs/webpack.config')(__dirname);

module.exports = _.merge(cfg, {
	entry: {
		app: path.resolve(__dirname, 'custom.ts')
	}
});```

### Expected Behavior

Cache with no problem, as it before

### Actual Behavior

Cache didnt work i `webpack-cli --config webpack.config.js`

### Environment

```shell
UBUNU

Is this a regression?

Yes (please specify version below)

Last Working Version

6.0.1

Additional Context

No response