WordPress 5.5 Upgrade Issue
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HubSpot plugin 7.40 was installed recently on WP 5.4.2. A staging environment copy was upgraded to WP 5.5 with no issues. However, after upgrade of production to 5.5, the post editor (Gutenberg) while editing pages/posts rendered an almost empty screen and developer console revealed multiple javascript errors: “The block <Block Name> must have a registered category.” pointing to the /wp-content/plugins/leadin/js/dist/gutenberg.js file (as well as a core WP file).
Disabling the plugin, the errors disappeared. Re-activating the plugin, the errors did not return.
This post serves to help others who may experience similar issues. Things to note/recap:
1) There were no issues with the published/public site, only with the post editor (Gutenberg).
2) Issue only occurred on Production, not on Staging/Test environment.
3) Production uses Cloudflare and WPEngine, Staging does not use Cloudflare. Cloudflare cache was purged but did not resolve the issue.
4) Production and Staging use WP-Rocket for front-end optimizations. WP-Rocket cache was cleared but did not resolve the issue.
5) The Gutenberg editor menu icons styles were 5.4.2 after the upgrade to 5.5. Post-fix, the menu icons were the correct 5.5 style.
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