Hi Michael,
Thanks for your awesome plugin !
I’m using it on a multilingual website with WPML and the WPML support noted somehting while helping me debug their breadcrumbs :
In CPTUI > Add / Edit Post types > Edit Post types tab > Name_of_the_CPT, we needed the Has Archive parameter to be false. Even if it was, WPML still saw it as true.
We had to empty the field Slug just underneath (as long as there was something in it, the false parameter was ignored).
WPML support suggested that I reported this, so here I am ??
Thanks and have a nice day !