Has anyone gotten dovecot 2.3 metrics to work (with netdata 2.2.3)? (failed to read values line from export global response )

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Problem/Question

I cannot get the dovecot collector to work, and the combination of the dovecot documentation with the netdata docs is confusing more than anything.

I have the old_stats plugin enabled.
I can netcat into localhost 24242 and get results with the EXPORT\tglobal\n command.

Following the debug procedure in the collector documentation I get an error :

[snipped]
CONFIG go.d:collector:dovecot:dovecot create accepted job /collectors/jobs stock 'internal' 'schema get enable disable update restart test userconfig' 0x0000 0x0000

DBG jobmgr/manager.go:303 creating dovecot[dovecot] job, config: map[__provider__:dummy __source__:internal __source_type__:stock autodetection_retry:0 module:dovecot name:dovecot priority:70000 update_every:1] component="job manager"
ERR module/job.go:243 check failed: failed to read values line from export global response collector=dovecot job=dovecot

Doveconf mail_plugins output:

mail_plugins = quota mailbox_alias acl mail_log notify old_stats

Relevant docs you followed/actions you took to solve the issue

Netdata collector docs
Dovecot old_stats / statistics docs

Environment/Browser/Agent’s version etc

FreeBSD 14.2
Dovecot 2.3.21
Netdata 2.2.3

What I expected to happen

Netdata to collect dovecot stats.