test-fixtures/cyrillux-usemarcon-replacement/f04/metadata.json
{
"description": "Fix: Add missing 33X fields for a microfilm",
"comment #1": "336$b txt is an educated guess/fallback",
"comment #2": "008/23=a means microfilm 337$b=h. No 300 nor 007, so we emprirically default to 338$b hj",
"only": false,
"fix": true
}