IMA 20 legacy javascript chunks wrong contenthash runtime x filename

[vaclav-pur]

Hi,
with updating on IMA 20 we discovered, that for legacy javascript webpack generates different contenthash for chunks (async router) to runtime and as filenames. Bundle is ok.
We used this hotfix to fix it ima.config.js:

        if (ctx.isClient) {
            config.output = config.output || {};
            config.output.chunkFilename = 'static/js/chunk.[id].[chunkhash:16].js';
        }

Please let me know whether you need anything more.

Václav Pur