Dependency parsing: is there some way to discourage multiple `nsubj` dependents?

A very weird English tree produced by Stanza 1.6.0 in the demo:

My cousin my extremely rude colleague admired last year chewed the chicken enthusiastically.

In UD, no word is allowed to have multiple (plain) nsubj dependents. But "admired" has two.

Is there a recommended alternate training or decoding method in Stanza that could avoid this sort of problem?