Mark jstests/concurrency/fsm_workloads/view_catalog_cycle_lookup.js, with the tag assumes_balancer_off directly in v6.3 to fix BF-27740. This will return the failing test (concurrency/fsm_workloads/view_catalog_cycle_lookup.js) to its prior status quo of not running with balancer enabled. (The YAML files were changed to allow this test to run with balancer enabled by SERVER-73385 in v6.3 on 2023-02-07, the first day BF-27740 started failing.)

The root cause of the BF failure (SERVER-74380) was apparently already fixed in v7.0 by some other ticket unknown to me – see https://jira.mongodb.org/browse/SERVER-74380?focusedCommentId=5279448&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-5279448 for details.