While testing another issue on my localhost WP site, I noticed the wc-square-admin-products.js is buggy.

On a variable product, once sync is enabled and I reload the page, the script marks the sync checkbox unchecked because it checks for if ( isVariable() && ! $( 'input[id^="variable_sku"]' ).length ) { too early.

This is a bit intermittent too. On Firefox, I am able to replicate it almost everytime on my site as well as the merchant's site.