Solved.
When you open an IFC directly, MEP library is loaded.
When you are linking the IFC into a project which hasn't loaded MEP library because is another discipline, some objects are not converted.
So, you need to load MEP Library and the issue is solved.
David Delgado Vendrell
http://www.daviddelgado.cat
GIGABYTE AERO X16 16" AMD Ryzen AI 7 350 32GB 1TB SSD White Copilot+ RGB
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AC18-AC28 INT/SPA (64-bit, latest build)
Surfing with Archicad since 2013 I decided to not switch to the Subscription path, and stay with AC28 proprietary license. We'll see what the future brings us...