Does the API 50k character limit in testing also cause errors in prod?

I am using Cloud Vision API for OCR on 2-3 images at a time. When I test the API call in "Response & Test" it says the results are truncated due to 50k character limit (Cloud Vision API provides a boundingPolygon result for each word identified). Is this limit also used in production? My API call in the web app is erroring out despite showing a truncated result in testing.

Console log in web app:

Failed to load resource: the server responded with a status of 404 ()

manifest.json:1 Manifest: Line: 1, column: 1, Syntax error.

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vision.googleapis.com/v1/images:annotate?key=AIzaSyBryp5ayEyRNx_H3D1hYhQ9qdgOX80_oLY:1

Failed to load resource: the server responded with a status of 400 ()

manifest.json:1

Failed to load resource: the server responded with a status of 404 ()