How to set up BrowserSync in Gulp that proxy Flask?

Question

Flask

var browserSync = require("browser-sync").create();

var paths = {
    styles: {
        src: "static/sass/style.scss",
        dest: "static/css"
    }
}

function reload() {
    browserSync.reload();
}

function style() {
    return (
        gulp
            .src(paths.styles.src)
            // Initialize sourcemaps before compilation starts
            .pipe(sourcemaps.init())
            .pipe(sass())
            .on("error", sass.logError)
            // Use postcss with autoprefixer and compress the compiled file using cssnano
            .pipe(postcss([autoprefixer(), cssnano()]))
            // Now add/write the sourcemaps
            .pipe(sourcemaps.write())
            .pipe(gulp.dest(paths.styles.dest))
            .pipe(browserSync.stream())
    );
    reload();
}
 
function watch() {
    browserSync.init({
        // You can tell browserSync to use this directory and serve it as a mini-server
        proxy: "127.0.0.1:5003"
        // If you are already serving your website locally using something like apache
        // You can use the proxy setting to proxy that instead
        // proxy: "yourlocal.dev"
    });
    gulp.watch("static/sass/*.scss", style);
    gulp.watch("templates/*.html", reload);
}

var gulp = require("gulp"),
    sass = require("gulp-sass"),
    postcss = require("gulp-postcss"),
    autoprefixer = require("autoprefixer"),
    cssnano = require("cssnano"),
    sourcemaps = require("gulp-sourcemaps");
    

exports.watch = watch;
exports.style = style;

this is gulpfile.js .
Style works fine, when changing scss files it compiles and updates.
And when I update the template, the update works only once, the line appears
[14:04:53] Starting 'reload'...
[Browsersync] Reloading Browsers...
The page is updated, but then gulp stops responding to changes. Please tell me how to fix this. Thank you!