Bug?: ALTER MATERIALIZED VIEW mv SET PARALLELISM will cause meta stuck to inject new barriers

[StrikeW]

Describe the bug

After we update a user's compute node to 16c, we want to alter the parallelism of a MV. But everytime we execute the ALTER command, will see a stuck of generating new barriers. And the ALTER command would also be stuck for a long time.

https://grafana.prod.risingwave.cloud/d/EpkBw5W4k/risingwave-dev-dashboard?from=1705147151016&orgId=1&to=1705159885928&var-component=All&var-datasource=P7AEF1E9BD6C1839A&var-instance=risingwave&var-namespace=rwc-g1hhgcv4t0f0k8cr19qbl8coqk-test&var-pod=All&var-table=All

Error message/log

https://grafana.prod.risingwave.cloud/explore?panes=%7B%22T9o%22:%7B%22datasource%22:%22P557A01600E289668%22,%22queries%22:%5B%7B%22refId%22:%22A%22,%22expr%22:%22%7Bapp%3D%5C%22risingwave-meta-default%5C%22,namespace%3D%5C%22rwc-g1hhgcv4t0f0k8cr19qbl8coqk-test%5C%22%7D%20%7C~%20%5C%22reschedule%5C%22%22,%22queryType%22:%22range%22,%22datasource%22:%7B%22type%22:%22loki%22,%22uid%22:%22P557A01600E289668%22%7D,%22editorMode%22:%22code%22%7D%5D,%22range%22:%7B%22from%22:%221704988800000%22,%22to%22:%221705244400000%22%7D%7D%7D&schemaVersion=1&orgId=1

To Reproduce

ALTER MATERIALIZED VIEW xx.mv SET PARALLELISM = 16

Expected behavior

No response

How did you deploy RisingWave?

No response

The version of RisingWave

v1.6-da175e8

Additional context

https://risingwave-labs.slack.com/archives/C0606NNR74P/p1705152091117739?thread_ts=1705135558.026809&cid=C0606NNR74P