Y25-008 - [BUG] Exception qc_files#index (JsonApiClient::Errors::InternalServerError) "500 Internal

[harrietc52]

Describe the bug
There is a repeated exception for Limber (prod):

[Psd-exceptions] [Limber PRODUCTION] qc_files#index (JsonApiClient::Errors::InternalServerError) "500 Internal 
A JSON::GeneratorError occurred in qc_files#create:

Acceptance Criteria

• Identify the root cause
• Finding and applying a solution
• Document progress + summary in the issue comments

Additional context

• URL : https://limber.psd.sanger.ac.uk/limber_plates/d4c986b2-70f8-11ef-95ac-0242391542d4/qc_files
• HTTP Method: GET
• IP address : 10.80.240.44
• Parameters : {"controller"=>"qc_files", "action"=>"index", "limber_plate_id"=>"d4c986b2-70f8-11ef-95ac-0242391542d4"}
• Timestamp : 2025-01-08 09:11:47 +0000
• Server : limb-prod-jammy
  • Rails root : /var/www/limber/releases/20250107130101
• Process: 2376764