Using a GET operation on the operation-location URL could you please check the status of the job?
This is documented on this page to check the update status of source. The query should look like below:
curl -X GET -H "Ocp-Apim-Subscription-Key: {API-KEY}" -H "Content-Type: application/json" -d '' 'https://{ENDPOINT}.api.cognitive.microsoft.com/language/query-knowledgebases/projects/{PROJECT-NAME}/sources/jobs/{JOB-ID}?api-version=2021-10-01'
I believe the status of the job has most probably failed so the update is not seen in your project in language studio.
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