We have a WCF project where JSON responses are generated automatically, but in one scenario, we create JSON manually and send it to the browser. This part works great.
Last night I noticed a mistake and tried to understand it, but the problem is really strange. Somehow, after the concatenation of string values, the block is deleted, and I do not know what happened here. See the following code, what happens?

Below is a JSON snapshot after "innerBlock" returned data

Below is a JSON snapshot after adding a line!

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