It most commonly happens in County Jails where some judge denies bail.
It also happens when jails are overcrowded and nobody takes the side of the person who is jailed.
Communication in jail is hugely rationed and difficult to do. You have to pay for it. You are not allowed personal contact. The hours available are enormously restricted.
This allows people who do not have money or people keeping track of them are kept in jail and have not way of contacting counsel or any advocate outside the jail.
Big problem. What good is your right to call counsel when you don’t have a phone number or someone outside to call for you?
They can make excuses but they need to go to prison for operating their organizations Soviet style and imprisoning people without trials and even incommunicado.
These are the systems of the well paid/well pensioned people operating them, they need to be arrested and tried for their crimes.
This is also a breakdown in judicial and jail procedures. In addition, from a handful of such cases I recall over the years, the defendants tend to be not very bright.
Ain’t bail its weather God wants you to continue to serve HIM/I AM