After creating a Function POU, it is not possible to then create an SFC POU.
Steps to recreate:
* Create a new Function POU. SFC is not allowed for Functions, so SFC does not show in the Implementation language dropdown.
* Click Add Object -> POU... Function is selected for Type.
* Select Program
* SFC is not present in the Implementation language dropdown
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After creating a Function POU, it is not possible to then create an SFC POU.
Steps to recreate:
* Create a new Function POU. SFC is not allowed for Functions, so SFC does not show in the Implementation language dropdown.
* Click Add Object -> POU... Function is selected for Type.
* Select Program
* SFC is not present in the Implementation language dropdown