Ticker All the continuous contracts
Security Type Future
Market USA
Resolution Minute
Status Cannot Be Resolved

In the attached backtest you can see prints of the GC continuous contracts.

If you run the EXACT same code today it will print different values.
This is not a problem only with GC, it's just an example, all the cont. contracts were changed somehow.
You can try CL or HG (crude oil or copper) to see the same issue