Parallel crash test case sometimes fails #2262
Description
Typically on R-devel Linux:
══ Failed tests ════════════════════════════════════════════════════════════════
── Failure ('test-parallel-crash.R:22:3'): crash ───────────────────────────────
Expected `err` to inherit from "testthat_process_error".
Actual class: "c_error"/"rlib_error_3_0"/"rlib_error"/"error"/"condition".
── Failure ('test-parallel-crash.R:23:3'): crash ───────────────────────────────
Expected `err$test_file` to be equal to "test-crash-3.R".
Differences:
`actual` is NULL
`expected` is a character vector ('test-crash-3.R')
https://github.com/r-lib/testthat/actions/runs/18295383735/job/52092436840