Fix 'Producer was not unregistered' error #2681

Job	Run time
changes	6s
lint-newsfile	48s
lint-crlf	6s
check-lockfile	8s
lint	54s
Typechecking	1m 35s
check-sampleconfig	1m 4s
check-schema-delta	59s
lint-pydantic	51s
lint-clippy	0s
lint-clippy-nightly	0s
lint-readme	0s
lint-rustfmt	0s
linting-done	4s
calculate-test-jobs	5s
complement (monolith, SQLite)	12m 25s
cargo-bench	0s
cargo-test	0s
complement (monolith, Postgres)	13m 26s
portdb (3.8, 11)	3m 30s
complement (workers, Postgres)	21m 16s
portdb (3.11, 15)	3m 16s
trial-olddeps	7m 39s
trial-pypy	0s
trial (3.8, sqlite, all)	5m 23s
sytest (focal)	8m 33s
trial (3.8, postgres, 11, all)	12m 5s
sytest (focal, postgres)	10m 3s
trial (3.8, sqlite)	4m 47s
sytest (focal, multi-postgres, workers)	13m 17s
sytest (focal, multi-postgres, workers, asyncio)	19m 6s
export-data	2m 8s
tests-done	3s
	2h 23m 37s

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