basalt-26.3.2-rc-20260916: kv/kvserver: TestDelegateSnapshot failed

kv/kvserver.TestDelegateSnapshot failed on basalt-26.3.2-rc-20260916 @ 024cf0f74e8abea8b9fe2f4a05441dac7dc66c41:

=== RUN   TestDelegateSnapshot
    test_log_scope.go:172: test logs captured to: outputs.zip/logTestDelegateSnapshot1433223104
    test_log_scope.go:82: use -show-logs to present logs inline
    test_server_shim.go:146: using test tenant configuration from testserver factory defaults
    test_server_shim.go:639: DRPC is enabled (via testserver factory defaults)
    replica_learner_test.go:471: 
        	Error Trace:	pkg/kv/kvserver/replica_learner_test.go:471
        	Error:      	Not equal: 
        	            	expected: 4
        	            	actual  : 1
        	Test:       	TestDelegateSnapshot
        	Messages:   	Wrong type of request range_id:88 coordinator_replica:<node_id:1 store_id:1 replica_id:1 type:VOTER_FULL > recipient_replica:<node_id:2 store_id:2 replica_id:4 type:LEARNER > delegated_sender:<node_id:4 store_id:4 replica_id:3 type:VOTER_FULL > term:6 first_index:24 descriptor_generation:6 queue_on_delegate_len:3 snap_id:f35ee192-a5ca-480e-9e37-00dfa8dc15cd 
    panic.go:694: -- test log scope end --
test logs left over in: outputs.zip/logTestDelegateSnapshot1433223104
--- FAIL: TestDelegateSnapshot (34.17s)

Parameters:

• attempt=1
• race=true
• run=2
• shard=13

Start with TestDelegateSnapshot in pkg/kv/kvserver/replica_learner_test.go, especially the failing assertion at line 471. Review the linked test report and captured logs, then reproduce the failure with the reported race-enabled settings. Done means identifying the cause, applying an appropriate fix, and getting TestDelegateSnapshot to pass.