You can use the following JQL to find that issue:
summary ~ "XX_54_GCSE1234_TEST"
Since the Summary (issue title) field uses a "like" search (ex: "~") you can also search for part of the string you provided. Example:
summary ~ "XX*"
summary ~ "TEST"
The fuzzy search doesn't always return what you want though, so you'll have to play with it if the above doesn't help. I don't know much about the logic when special characters are present. Maybe someone else in the Community can comment further.
Also, you can't use "=" with the Summary field.
Hope this helps,
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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