Steps to replicate the issue (include links if applicable):

• Use the Wikibase REST API to call a PUT request on Property:P570 of Robert Nixon Q7348050

Based on the issue reported here: https://www.wikidata.org/wiki/Wikidata:Project_chat/Archive/2023/12#Need_help_regarding_a_PUT_request. (original link)

What happens?:

• The API returns a 404 statement not found

What should have happened instead?:

• The proposed change in statement should have been successful

Software version (skip for WMF-hosted wikis like Wikipedia):

• REST API beta version on Wikidata

Task Breakdown Notes

• Option 1: Do not normalize (i.e. uppercase) statement GUIDs in our output and continue retrieving the statement by case-sensitive GUID.
• Option 2: Continue normalizing the output and retrieve the statement by case-insensitive GUID.

Note: We need to be careful not to overwrite an existing lowercase statement GUID with an uppercase one.