Thank you for your help, Torsten!
These are my currently active plugins apart from ASB. I disabled Jetpack entirely and it made no difference. The Toocheke theme also has a companion plugin, was that included in the test?
Better Search Replace
A small plugin for running a search/replace on your WordPress database.
Blogger Importer Extended – Redirects enabled
The only plugin you need to move from Blogger to WordPress. Import all your content and setup 301 redirects automatically.
Ko-fi Button
A Ko-fi donate button for your website!
Media Library Folders
Gives you the ability to adds folders and move files in the WordPress Media Library.
Post Type Switcher
A simple way to change a post’s type in WordPress
Redirection
Manage all your 301 redirects and monitor 404 errors
SVG Support
Upload SVG files to the Media Library and render SVG files inline for direct styling/animation of an SVG’s internal elements using CSS/JS.
Toocheke Companion
Theme specific functions for the Toocheke WordPress theme.
Best regards,
Jay