When using illuminate/collections as a stand alone package, it makes calls to the data_get function (11 places) which is not defined. It is in Illuminate/Support/helpers.php (which is not available in the stand-alone package).
illuminate/collectionsArr::pluck()I'm not sure how you would want to fix this but let me know if I can help! (Ref: #32478)
@kbond we're checking in on this. Thanks for testing Laravel 8!
Fixed now. :)