Problem:
The user would like to create a view, in the blocks editor, to display all the items from an Repeatable Field Group(RFG) field, from all the parent posts.
Solution:
This use case is not supported for blocks based views. Either, create the view with the classic editor, or use a one-to-many relationship instead of an RFG.
The nested View is showing ALL the matching terms, despite the fact that the view is set to only show 1 matching result.
Solution:
The problem is abnormal, please check these:
In case it is a compatibility problem, please deactivate all other plugins, and switch to WordPress default theme 2021, deactivate all custom PHP/JS code snippets, and test again