I found 174 files with filenames ending "services.yml". Only one mentioned "menu.default_tree_manipulators", namely menu_item_role_access.services.yml
Thanks Liam
I have been using MIRA for a long time and have never had any issue before. I am very much a hobbyist so I don't really understand the internals of Drupal as well as many. It was only this year that I finally bit the bullet and applied Composer and Drupal 10 to my sites.Since then I run composer update "drupal/*" --with-all-dependencies any time any update is required. Wonderful!
Now I'm having this problem updating MIRA from 2.1 to 2.3. I'll have to update core and other contrib separately until this issue is fixed.
As I'm far from being an expert I'm not sure what further info I should provide but I really appreciate your offer of help.
nickbooth → created an issue.