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Genus : Auto_ungroup breaks functionality

Schriek

Hi,

I've been using the 'auto_ungroup = false' attribute on the root design in Genus to keep a clear hierarchy in my design, as it is easier to partition later on.
Weirdly enough, a post-synthesis simulation with auto_ungroup enabled works fine, while disabling the property causes the simulation to fail (function wise).
First, is this a bug or a hidden feature? Secondly, as I want to keep my hierachy, are there other solutions available?

(The design is a simple SoC with RISC-V cpu, I rather not spend time on debugging if I can change just one synthesis attribute)

Thanks. 

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