fix bug in composite surface form model #9934

Job	Run time
style	26s
Doctests (ubuntu-latest / Python 3.11)	5m 25s
Example scripts (ubuntu-latest / Python 3.12)	17m 36s
Tests (ubuntu-latest / Python 3.9)	31m 29s
Example notebooks (ubuntu-latest / Python 3.12)	20m 58s
Tests (ubuntu-latest / Python 3.10)	31m 39s
Tests (ubuntu-latest / Python 3.11)	29m 41s
Tests (ubuntu-latest / Python 3.12)	35m 13s
Tests (macos-12 / Python 3.9)	22m 25s
Tests (macos-12 / Python 3.10)	22m 53s
Tests (macos-12 / Python 3.11)	27m 54s
Tests (macos-12 / Python 3.12)	25m 37s
Tests (macos-14 / Python 3.9)	11m 39s
Tests (macos-14 / Python 3.10)	11m 3s
Tests (macos-14 / Python 3.11)	20m 18s
Tests (macos-14 / Python 3.12)	9m 49s
Tests (windows-latest / Python 3.9)	25m 30s
Tests (windows-latest / Python 3.10)	27m 21s
Tests (windows-latest / Python 3.11)	27m 45s
Tests (windows-latest / Python 3.12)	25m 10s
	7h 9m 51s

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