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Please check Atlassian’s documentation on ‘Lookup issues’

Add (newly created) Jira-native linked Issues to Issue Picker

Issue Picker does not add newly created issue links to Issue Picker fields.

You can, however, use automation to add newly created links to Issue Picker fields:

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Use When: Issue linked to start the rule on creation of a new linked issue and use the Advanced mode of Then: Edit issue field to add the key of the destination issue of the link to to contents of the issue picker field:

Syntax: Edit issue fields

{
	"fields": {
		"customfield_10197": [{{#customfield_10197}}"{{.}}",{{/}}"{{destinationIssue.key}}"]
	}
}

Here the ID of the Issue Picker custom field is customfield_10197. Replace this with the respective field ID in your Jira instance.

Add (existing) Jira-native linked Issues to Issue Picker

Issue Picker does not add issues, which are already linked natively in Jira to the Issue Picker custom fields.

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