As many reports regarding PHP 8 as possible would be terrific. I'm developing on PHP 8 but not with 100% of addons out there, especially commercial ones.
Can you confirm which style and page (section) you encounter this on? And whether in AMP or non-amp. It looks like your breadcrumb is being populated with no items present.
If these issues are related to the addon, they are almost certainly related to the Extended Breadcrumb feature which is being polished before stable release. Some 3rd party styles and addons also affect the breadcrumb so I'm making sure everything is 100% compatible.
Very nice
. I have still to write up my step by step walkthrough here at XF.com about using this (or other addons) on increasing rank through custom meta titles and description tags. On that note I will mention that other than indexing control, the #1 possible benefit from this addon IS custom titles & descriptions, and forming good snippets through the Google Live Preview.
However that does take some keyword research which I will talk about in the write up.
UBS support is already present, the FAQ needs to be updated to mention this. Note however.. UBS prior to version 2.1.16 supported some of the features this addon introduces, so providing the dual/legacy mode like I did for AMS would have been messy. Because of that there are no custom meta titles & descriptions added for UBS prior to 2.1.16. You'll need to run a later or current copy of UBS to get the full feature set where this addon and UBS work together.