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Thanks to @JasonGlazer and @Denis Bourgeois, EMS output is simply lagging behind every timestep that can be due to reporting an HVAC state variable (like node WBT) too soon (i.e. before it gets calculated or initialized at runtime), so it's ends up reporting the previous timestep value. I will try EndOfSystemTimestepBeforeHVACReporting (i.e. system variable) as suggested by @Denis Bourgeois to solve the lagging issue. I have missed this observation because my question was based on the comparison graphical results I got using Design Builder viewer that I now found out plots the two variables with non-unified Y-axis scale.

Thanks to @JasonGlazer and @Denis Bourgeois, EMS output is simply lagging behind every timestep that can be due to reporting an HVAC state variable (like node WBT) too soon (i.e. before it gets calculated or initialized at runtime), so it's ends up reporting the previous timestep value. I will try EndOfSystemTimestepBeforeHVACReporting (i.e. system variable) as suggested by @Denis Bourgeois to solve the lagging issue. I have missed this observation because my question was based on the comparison graphical results I got using Design Builder viewer that I now found out plots the two variables with non-unified Y-axis scale.scale, hence looking very different.