sink(ticdc): fix incorrect `default` field (#12038)#12049

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ti-chi-bot[bot] merged 4 commits intopingcap:release-6.5from ti-chi-bot:cherry-pick-12038-to-release-6.5

Feb 8, 2025

+5-16

Commits on Feb 8, 2025

This is an automated cherry-pick of pingcap#12038

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