Array not being added to variable in foreach loop

Ran into a weird problem and I'm pulling my hair out with it.

I've got this foreach loop

foreach ($rubrics as $rubric) {

            $answers = ReaderRubricAnswer::where('rubric_id', "=", $rubric->rubric_id)->get();

            $rubric['answers'] = $answers;

            Log::info($rubric['answers']);
        }

If I check the logs for $rubric['answers'] it's exactly as it should be.

However, if I var dump $rubrics, none of them have the $rubric['answers'] to them.

I know it's something simple, I've just been staring at it too long to see it now.

Thanks!

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