Brian, I'm not sure if this is something new in V1.20, it is possible to disable the warning by setting the hide-diagnosis value to true in the data layer.
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The following links have information on the STO inputs. https://docs.automation.boschrexroth.com/doc/3851353543/dynamization/latest/en/ https://docs.automation.boschrexroth.com/doc/2721309818/xg41-safety-technology-safe-torque-off/latest/en/
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Codesys uses null-terminated strings, the string is missing the null at the end. You can use the IL_BufferToString function to get a properly terminated string.
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