ID 434834 - Multiple curves are not recognized when using particle sieve modifier and curve falloff.

Problem summary
Multiple curves are not recognized when using particle sieve modifier and curve falloff.

Customer reported version
modo.14.0v1

Customer reported platform
windows10

Steps to reproduce

1) Download and open the attached scene file.
2) Go to the Setup layout and in the Schematic viewport connect the Particle Modifier output to the Particle Sieve Modifiers Particle source input.
3) Connect the Particle Sieve Modifiers output to the Replicator nodes Particle Source input.

Expected behaviour
It should work with multiple curves.

Actual behaviour
Only one curve is recognized.

Workaround
Unknown.

Reproduced by support

This bug has been reproduced in:
14.0v1 - Windows 10 

13.2v1 - Windows 10

Earliest version tested

13.1v1 - This feature did not exist before this version.