This is primarily historical.
The standard APIs have never contained these values across the history of the Twitter platform. The enterprise APIs have done so since they have been in existence.
The premium APIs are built on the enterprise technology platform and there is currently no plan to extend these values to the standard tier (just as there’s no current plan to add other Tweet enrichments to the standard tier). If it helps, these values are present in the free Sandbox for the premium API products.
We apologise that this is a disappointing situation for some developers. Please follow the roadmap for future updates.