I’m experiencing the same problem with fresh installs of WP version 4.9.4, Yoast SEO 6.3
Error loading locale data for locale: zh
Error: Loading chunk 1 failed.
(anonymous) @ wp-seo-help-center-630.min.js?ver=6.3:6
Promise.catch (async)
u @ wp-seo-help-center-630.min.js?ver=6.3:6
e.default @ wp-seo-help-center-630.min.js?ver=6.3:6
1306 @ wp-seo-help-center-630.min.js?ver=6.3:1
t @ commons-630.min.js?ver=6.3:1
window.yoastWebpackJsonp @ commons-630.min.js?ver=6.3:1
(anonymous) @ wp-seo-help-center-630.min.js?ver=6.3:1
