Spline Deformer Position Delta cannot register Link value modifier

Notch Builder:

Cannot link output value modifier to Any Position Delta of the Spline Deformer.

Very low

Reproduction steps :

  1. Add a Spline Deformer node
  2. Add, for example, a Math Modifier
  3. Try to link the output of the Math Modifier to Any Position Delta X/Y/Z of the Spline Deformer node

Expected result:
A link

Actual result:
Link is invalidated

No Warning / Error Logging

I guess it’s because of the Delta nature of the parameters, but there’s no ergonomic behaviour to tell the difference.
Mind that the Key frames behaviour in Curve Editor works as expected.

No workaround needed.