## What
The version soft-ref sync (#22821, on main / the 2.22 line, not yet
released) added a **write-back** step: after copying a `workflowVersion`
into `core.workflowVersion`, it sets `coreWorkflowVersionId` on the
workspace record. On workspaces that predate that field (new standard
fields aren't auto-provisioned onto existing workspaces), the write-back
throws:
`Field metadata for field "coreWorkflowVersionId" is missing in object
metadata workflowVersion` (from `formatData`).
This breaks the sync wherever it runs on an unprovisioned workspace —
the backfill (when it runs under the new code) and the dual-write (on
any workflow-version create/update). Observed on staging while upgrading
to 2.22: 2 of 70 workspaces. **2.20 itself was fine** — it ran the old
shared-UUID sync, which had no write-back.
## Fix
Guard the write-back: check the workspace's `workflowVersion` object for
the `coreWorkflowVersionId` field (via `workspaceCacheService` flat
field maps) and skip it with a warning if absent, instead of throwing.
The core row is still upserted; the workspace gets linked later once the
field is provisioned.
## Follow-up
Provisioning `coreWorkflowVersionId` onto existing workspaces and
linking them is #22944 (version side). The workflow-side equivalent
follows with the workflow-side sync PR.
## Test
Unit test covers both branches: field absent → write-back skipped, no
throw, core upsert still runs; field present → write-back runs.
Typecheck + lint clean.
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Thomas Trompette
e9bc06a830
