so on pic 2 (right) we previously already had the two large holes in there. Now, when adding an AECOsim penetration (top right) it fills in these holes, and cuts half way through the wall. pretty wierd. This has happened in a few different areas - e.g where walls have been trimmed around beams, the "trim" has popped back to its pre-cut position once a penetration has been introduced. Interestingly, if we move the penetration a few cm away from the edge, it cuts fine!
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