We were trying to associate/switch project to a specific issuetype scheme, during the process many irrelevant project issues are updated.
Does anyone know whats the reason behind it?
Is there any JIRA issue/bug linked to this scenario?
Welcome to the Atlassian Community!
Schemes are project configuration settings, they apply to the whole project, not bits of it.
There are no "irrelevant project issues" - the scheme changes you are applying apply to everything in the project, by definition.
There are no bugs or issues with this, it is behaving as designed and intended.
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