Fix notebook CommManager extraction of buffers #10440

Job	Run time
Setup workflow	7s
Run pre-commit	27s
UI tests on ubuntu-latest with Python 3.9	11m 46s
Core tests on Python 3.12, ubuntu-latest	2m 57s
UI tests on macos-latest with Python 3.9	8m 37s
UI tests on windows-latest with Python 3.9	28m 18s
Unit tests on ubuntu-latest with Python 3.9	4m 26s
Unit tests on ubuntu-latest with Python 3.11	4m 43s
Unit tests on macos-latest with Python 3.9	3m 9s
Unit tests on macos-latest with Python 3.11	4m 20s
Unit tests on windows-latest with Python 3.9	22m 36s
Unit tests on windows-latest with Python 3.11	18m 4s
Unit tests on ubuntu-latest with Python 3.10	8m 44s
	1h 58m 14s

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