mzumsande pointed out https://github.com/bitcoin/bitcoin/pull/32345#issuecomment-3286964369 that this test was causing a warning:
Warning: Disk space for "/tmp/test_common bitcoin/node_init_tests/init_test/bf78678cb7723a3e84b5/blocks" may not accommodate the block files. Approximately 810 GB of data will be stored in this directory.
Fix by setting regtest instead of mainnet network before running the test.
Currently this code is not called in unit tests. Calling should make it
possible to write tests for things like IPC exceptions being thrown during
shutdown.