Base material does not report broken logic with disconnected nodes, but instances of the same material do.

This is likely "by design", but the licensee is requesting a warning in base materials for disconnected logic that does not work, which they are reporting as a nuisance during development.

Instance:

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Base Material:
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Licensee repro can be found here - https://github.com/lobneroO/UeMaterialError

However it is a very simple repro, create any material with functionality that does not compile.

Disconnect the final node of that sequence, or connect it to a disabled node, from the material attributes -> no errors reported + save

Create a material instance of that material -> error is reported.