certain node keys of mb_master(expected to be preserved) are deleted after removal from cluster

root@deb91-qe:~/cbcollect_info__20210418-084025# grep guts ./*

./cbcollect_info.log:[2021-04-18T01:41:00.017721-07:00] Found dump-guts: /opt/couchbase/bin/dump-guts

./cbcollect_info.log:[2021-04-18T01:41:00.449541-07:00] Error occurred getting server guts: Got exception: {error,badarg}

./cbcollect_info.log: {'dump-guts__escript__1618__735260__100096__2',extract_rest_port,2,

./cbcollect_info.log:     [{file,"/opt/couchbase/bin/dump-guts"},{line,458}]},

./cbcollect_info.log: {'dump-guts__escript__1618__735260__100096__2',main_with_everything,4,

./cbcollect_info.log:     [{file,"/opt/couchbase/bin/dump-guts"},{line,553}]},

./cbcollect_info.log: {'dump-guts__escript__1618__735260__100096__2',main,1,

./cbcollect_info.log:     [{file,"/opt/couchbase/bin/dump-guts"},{line,136}]},

./cbcollect_info.log:[2021-04-18T01:41:00.449758-07:00] Found dump-guts: /opt/couchbase/bin/dump-guts

./cbcollect_info.log:[2021-04-18T01:41:00.910117-07:00] Error occurred getting server guts: Got exception: {error,badarg}

./cbcollect_info.log: {'dump-guts__escript__1618__735260__536239__2',extract_rest_port,2,

./cbcollect_info.log:     [{file,"/opt/couchbase/bin/dump-guts"},{line,458}]},

./cbcollect_info.log: {'dump-guts__escript__1618__735260__536239__2',main_with_everything,4,

./cbcollect_info.log:     [{file,"/opt/couchbase/bin/dump-guts"},{line,553}]},

./cbcollect_info.log: {'dump-guts__escript__1618__735260__536239__2',main,1,

./cbcollect_info.log:     [{file,"/opt/couchbase/bin/dump-guts"},{line,136}]},

./cbcollect_info.log:[2021-04-18T01:41:00.910313-07:00] Found dump-guts: /opt/couchbase/bin/dump-guts

./cbcollect_info.log:[2021-04-18T01:41:00.910408-07:00] Couldn't read server guts. Using some default values.

./cbcollect_info.log:[2021-04-18T01:41:00.910594-07:00] Adding persistent buckets '['default']' to server guts

./couchbase.log:261702 -rwxr-xr-x 1 couchbase couchbase    30378 Apr 16 04:03 dump-guts

root@deb91-qe:~/cbcollect_info__20210418-084025# more /opt/couchbase/bin/dump-guts 

[root@s44015 cbcollect_info_ns_1@cb.local_20210422-180448]# grep guts ./*

./cbcollect_info.log:[2021-04-22T11:05:58.869377-07:00] Found dump-guts: /opt/couchbase/bin/dump-guts

./cbcollect_info.log:[2021-04-22T11:06:00.181186-07:00] Adding persistent buckets '['default', 'beer-sample']' to server guts

grep: ./chronicle: Is a directory

./couchbase.log:101731032 -rwxr-xr-x. 1 couchbase couchbase    30378 Apr 16 03:19 dump-guts

grep: ./stats_snapshot: Is a directory

[root@s44015 cbcollect_info_ns_1@cb.local_20210422-180448]#