"Could not load suggestions" error when labeling documents in Custom Extractor

Google Cloud Build with AI AI Solutions
1

I’m trying to label freshly imported documents in Custom Extractor by clicking “Start Labeling” button. Normal behavior is for AI to pre-label detected fields. But this morning, I’m getting “Could not load suggestions” UI error.
Looking at the dev tools network tab I see an error message referencing pretrained-foundation-model-v1.0-2023-08-22 model. Where is this model coming from??? Yesterday the labeling process worked just fine.

“message”: “Processor 4c5e47bd6daa64f8 version pretrained-foundation-model-v1.0-2023-08-22 of type CUSTOM_EXTRACTION_PROCESSOR is no longer supported for sync processing. Please upgrade to a newer version: ``https://cloud.google.com/document-ai/docs/manage-processor-versions.”``,
“errorType”: “DATA_FETCHING_EXCEPTION”,
“path”: [
“processDocumentJspb2”
]

2

More on this bug.
Looks like detailed description for a derived signature field is causing this issue. If I clear the description for this field the Labeling Task works successfully.
Question to Google devs - why is the Labeling Task trying to use outdated pretrained-foundation-model-v1.0-2023-08-22 model when my processor’s default model is pretrained-foundation-model-v1.5-pro-2025-06-20?