Fix thinking block collapse/expansion #5268

Job	Run time
build-and-check	2m 41s
test-common	38s
test-cli	1m 6s
test-integration-packages/billing	38s
test-integration-packages/agent-runtime	44s
test-integration-web	37s
test-integration-packages/internal	40s
test-integration-.agents	45s
test-integration-common	41s
test-packages/billing	37s
test-.agents	44s
test-integration-sdk	38s
test-packages/agent-runtime	52s
test-packages/internal	45s
test-sdk	49s
test-web	50s
test-integration-cli	44s
	14m 29s

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