There in the restful.py component was an issue starting with hass 0.56.2 that limited the sensor data to 255 Character.
This post solved the issue: [SOLVED] Parsing a json value from an existing entity in a template sensor
There in the restful.py component was an issue starting with hass 0.56.2 that limited the sensor data to 255 Character.
This post solved the issue: [SOLVED] Parsing a json value from an existing entity in a template sensor