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C3D-CHECKMHOL · Check what landed after MHOLSYM error (read-only) done

Count SEWER_MANHOLE*/LEGEND entities to see what survived the crash.

C# payload

// READ-ONLY: did the manhole circles + any legend geometry actually land?
using System;
using System.Collections.Generic;
using Autodesk.AutoCAD.DatabaseServices;

var db = Db;
using (var tr = db.TransactionManager.StartTransaction())
{
    var ms = (BlockTableRecord)tr.GetObject(SymbolUtilityServices.GetBlockModelSpaceId(db), OpenMode.ForRead);
    var counts = new Dictionary<string,int>(StringComparer.OrdinalIgnoreCase);
    foreach (ObjectId id in ms)
    {
        var e = tr.GetObject(id, OpenMode.ForRead) as Autodesk.AutoCAD.DatabaseServices.Entity;
        if (e == null) continue;
        if (e.Layer.IndexOf("SEWER_MANHOLE", StringComparison.OrdinalIgnoreCase) >= 0
         || e.Layer.IndexOf("LEGEND", StringComparison.OrdinalIgnoreCase) >= 0)
        {
            var key = $"{e.Layer}/{e.GetType().Name}";
            counts[key] = counts.TryGetValue(key, out var c) ? c+1 : 1;
        }
    }
    Log("SEWER_MANHOLE* / LEGEND entities present:");
    foreach (var kv in counts) Log($"  {kv.Key}: {kv.Value}");
    tr.Commit();
}

Result

SEWER_MANHOLE* / LEGEND entities present:
  SEWER_MANHOLE_TEXT/DBText: 21