The Simple Mapping and Mapping Input transforms are not available for injecting metadata

Scenario
When using the ETL metadata injection transform, the Simple Mapping and Mapping Input transforms from the target pipeline are not available for injecting metadata in the Inject Metadata section.
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Expected result
The Simple Mapping and Mapping Input transforms should be available for metadata injection as per the documentation for the 2.1.0 Release

Metadata Injection :: Apache Hop

Actual result
The Simple Mapping and Mapping Input transforms are not available for injecting metadata in the Inject Metadata section
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General information
I tried this using Hop version 2.1.0 on Windows (Windows 10 Enterprise 21H1)