Because of the myriad combinations of designers, variation compatibilities, and quality control, plugins are typically the source of upgrade conflicts.
Thankfully, designer Antti Kuosmanen has created a brand-new plugin called WP Safe Upgrades that lets you test plugin updates in a 'sandbox' environment. This enables you to spot prospective update disputes before they have the opportunity to be a problem on your live website.
In practice, WP Safe Updates includes a brand-new Test Update button that appears when a plugin update is available. Clicking this button lets you sneak peek any modifications the plugin makes before committing to them. WP Safe Updates will reveal exactly how the updates will act on your actual website when you do things like creating new posts or altering settings.