OctaneRender® for Maya® 3.05.2 - 9.19 [OBSOLETE]

[renmaxhb]

set poly with hole materier to matte

Ok I see the problem and the difference of behavior between V2 and V3, thanks Renmaxhb
If it's a bug it's not in the plugin, it's in octane core (same problem in standalone),
It might also be that the bug is the behavior of V2 and it was fixed or maybe this have been changed on purpose for another reason (but I don't think so) .

I have asked in standalone Section:
viewtopic.php?f=24&t=58323&p=301016#p301016

In fact,when the Kernel Alpha shadow is on,the matte poly has no shadow,this is why

[calus]

In fact,when the Kernel Alpha shadow is on,the matte poly has no shadow,this is why

Right,
this seems to be a limitation of V3,
but thank to your scene, maybe Abstrax found another bug in Octane Core with Shadow catcher and Medium