Timing Violation Quartus "__Z" issue

In Quartus for the timing report have you ever gotten a timing violation to/from a signal ending with __Z - defining a false path using this doesn't fix this violation -

------------------------------------------------------- for e.g. say

I have two signals "signal_abc" and "signal_xyz"

I get a timing violation from signal_abc to signal_xyz__Z


any suggestions on what this means? Tristate condition perhaps ? how do I fix it ? defining a false path didn't help. thanks for your time.

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