[System Test] Rebalance failed while upgrading query node

In the system test while upgrading one of the query nodes from 7.2.3-6710 to 7.6.0-2117 the rebalance failed with the below error message

Rebalance exited with reason {service_rebalance_failed,index,

{worker_died,

{'EXIT',<0.10805.691>,

{task_failed,rebalance,

{service_error,

<<"Index bucket3.idx9_j7iK67C already exists">>}}}}}.

Rebalance Operation Id = 8114e5bc9272db59090dd4342fd4acc3 

Cluster configuration initially was kv-3, index-4, query-2 The KV nodes were upgraded, then one query node was upgraded and one index node was upgraded via swap rebalance ( removing the old node and adding the upgraded node and triggering a rebalance). While upgrading the second query node the rebalance has failed. Note - All upgraded nodes are installed in provisioned mode 

Jenkins job :

http://qa.sc.couchbase.com/job/component_systest_launcher_2/800/console

Logs

iteration 50

url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1707661116/collectinfo-2024-02-11T142614-ns_1%40172.23.106.180.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1707661116/collectinfo-2024-02-11T142614-ns_1%40172.23.106.189.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1707661116/collectinfo-2024-02-11T142614-ns_1%40172.23.106.246.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1707661116/collectinfo-2024-02-11T142614-ns_1%40172.23.107.20.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1707661116/collectinfo-2024-02-11T142614-ns_1%40172.23.107.23.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1707661116/collectinfo-2024-02-11T142614-ns_1%40172.23.107.77.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1707661116/collectinfo-2024-02-11T142614-ns_1%40172.23.107.98.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1707661116/collectinfo-2024-02-11T142614-ns_1%40172.23.97.124.zip
url : https://cb-jira.s3.us-east-2.amazonaws.com/logs/systestmon-1707661116/collectinfo-2024-02-11T142614-ns_1%40172.23.97.139.zip