Currently, when editing a Select List custom field's options, Jira will load all options. This will timeout when there are thousands of options.

With pagination and searching capabilities, we can avoid these errors.

Workaround:
Use the Rest API:

• https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-issue-custom-field-options/#api-rest-api-3-customfield-fieldid-option-put