cdc panic at `region_event_handler.go`

[asddongmen]

What I did?

Run default_value integration test on this branch: #793

make integration_test_mysql CASE=default_value

What happened?

[2025/01/06 19:40:41.742 +08:00] [PANIC] [region_event_handler.go:135] ["should not reach"] [event={}] [stack="github.com/pingcap/ticdc/logservice/logpuller.(*regionEventHandler).GetType\n\t/home/dongmen/tigate/logservice/logpuller/region_event_handler.go:135\ngithub.com/pingcap/ticdc/utils/dynstream.(*parallelDynamicStream[...]).Push\n\t/home/dongmen/tigate/utils/dynstream/parallel_dynamic_stream.go:91\ngithub.com/pingcap/ticdc/logservice/logpuller.(*regionRequestWorker).dispatchResolvedTsEvent\n\t/home/dongmen/tigate/logservice/logpuller/region_request_worker.go:253\ngithub.com/pingcap/ticdc/logservice/logpuller.(*regionRequestWorker).receiveAndDispatchChangeEvents\n\t/home/dongmen/tigate/logservice/logpuller/region_request_worker.go:200\ngithub.com/pingcap/ticdc/logservice/logpuller.(*regionRequestWorker).run.func4\n\t/home/dongmen/tigate/logservice/logpuller/region_request_worker.go:173\ngolang.org/x/sync/errgroup.(*Group).Go.func1\n\t/home/dongmen/tigate/vendor/golang.org/x/sync/errgroup/errgroup.go:78"]

log file:
cdc.tar.gz