CK II - [3.1 - KKAD] "Killed your spymaster" is not a valid reason to put character in jail

[MemeWizard]

One line summary of your issue
[3.1 - KKAD] "Killed your spymaster" is not a valid reason to put character in jail

Game Version
3.1 - KKAD

What expansions do you have installed?
All of the above

Do you have mods enabled?
No

Please explain your issue is in as much detail as possible.
Sometimes character may have an event where he kills the spymaster of his liege. However, it don't give liege the right to imprison the killer.
My character's wife (spymaster) was killed, but I can't imprison killer because I have "no valid reason".
I think the problem is connected with the fact that in the context of event 20290 death should be death_murder_unknown, but for some reason the event uses death_murder.

Steps to reproduce the issue.
Event 20290 must kill your spymaster

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[Ceebie]

Hi, I can't reproduce this. do you have a save that reproduces this issue?

 

[MemeWizard]

January 8, character's spymaster *can* die. Chance is not 100%, you may need several reloads
January 9, the plot is removed from the plotter, because the target is dead
On January 10th you cannot put the plotter in prison because you will not have a reason