How to tell ddp not to observe certain fields..?

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I see your original question through your historical edits.

I don’t think there are such straightforward feature to accomplish what you want (not to observe staticDataA and staticDataB). But, there are chance that might work with this.changed (

Or have you solved this question? Can you share with us?

I interest with this question. Can you re-open this question? Maybe someone who more capable will answer this question someday.