ckeditor.com/builder is broken by not including all plugins in the "Selected" column.
Checking back with my much older downloaded versions of CKEditor, this was the case back then too. Your site is not including all plugins it states it is when choosing the "Full" option or when being manually added to the bundle.
Quite annoying as it makes the builder uselss, but I'm glad I caught this as clearly nobody else has for years..........
Here are plugins that I had to manually download that did not download using the builder set to Full with these items either being by default in the "Selected" (left) column of the builder interface or manually being added by selecting them from the right column and clicking the arrow to move them to the left column: