[Bug]: Cannot "test real delay" for "JSON configs"

[farshadl]

预期情况

It should be possible to "test real delay" for "JSON configs"

实际情况

Cannot "test real delay" for "JSON configs"

复现方法

Cannot "test real delay" for "JSON configs"

日志信息

Cannot "test real delay" for "JSON configs"

额外信息

No response

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