It might have to do with the fact that the endpoint in question is meant to render XBlocks directly, and Sequences are being moved from rendering entirely as an XBlock to eventually be something that lives above the XBlock layer (so XBlocks would only be rendering at the Unit layer and below), per this ADR. We’re in a sort of hybrid state at the moment–the normal UI is driven by the Learning MFE and various API calls, but the SequentialBlock still exists and has rendering code.
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