gulp modifies gz-files during processing.

On version 5.0.0 for gz-files the original and encrypted have different file sizes and hashes. On version 4.0.2 there is no such problem

function build() {
    const sourceFile = "node_modules/mymodule/myfile.css.gz";
    const targetFile = "./wwwroot/production/css/themes/myfile.css.gz";

    console.log(`Original MD5: ${getHash(sourceFile)}`);
    return gulp.src(sourceFile, { buffer: true })
        .pipe(gulp.dest("./wwwroot/production/css/themes/"))
        .on('end', function() {
            console.log(`Copied file MD5: ${getHash(targetFile)}`);
        });
}

Original file MD5: 8b2225cc82b5b25928e00ad376b82708

Copied file MD5: 732a18c293222e7324b915d98dd6c13a