Hi Peter we discovered the issue:
We found that the problem occurred when we used the "taxonomy" type inside a group it wasn’t working (it worked before the update). However, when we created a new field of type taxonomy outside of a group, it worked fine. Later, we tested using the field type tax.taxonomy, and it worked properly, even inside the group.
So, the issue was that the group doesn't support the normal taxonomy type. It needs to use tax.taxonomy instead. I found this while checking the Metabox fields there were two custom fields related to breadcrumbs. I changed their type from taxonomy to tax.taxonomy.
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