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Posted a reply to Cannot make this work, on the site WordPress.org Forums:
Error in WordPress 5.5 was resolved by jQuery Migrate Helper. Enable jQuery Migrate Helper https://wordpress.org/plugins/enable-jquery-migrate-helper/
Plugins
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AddQuicktag
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Auto Featured Image (Auto Post Thumbnail)
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Cloudflare
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Collapsing Categories
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Custom Post Type Permalinks
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DB Cache Reloaded Fix
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Dynamic Widgets
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External Links
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External Links - nofollow, noopener & new window
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Fullscreen Galleria
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HeadSpace2 SEO
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Image Watermark
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JS Categories List Widget
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MO Cache
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Photo Galleria
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SEO Friendly Images
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Table of Contents Plus
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Theme Test Drive
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Widget Logic
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WordPress Tag, Category, and Taxonomy Manager - AI Autotagger
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WP PageSlide Plugin
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WP Shortcodes Plugin — Shortcodes Ultimate