Error while creating an DXF and importing it to AutoCAD

[Mannshoch]

Log of the converting is attached:
log.log

AutoCAD output:

DXF-ReadError
Error in in APPID Table
DXF-ReadError auf Line 106298.
Invalid or incomplete DXF input -- drawing canceled.

Some lines starting on Line: 106298

AT_JNT_�வ�வ齏跽풴ۂ㺘㻦칀ۂ��
 70
     0
  0
APPID
  5
2AE7
330
9
100
AcDbSymbolTableRecord
100
AcDbRegAppTableRecord
  2
AT_JNT_肘౐肘౐ᠺಜ풴ۥ䇴ሸ칀ۥ��
 70
     0
  0
APPID
  5
2AE8
330
9
100
AcDbSymbolTableRecord
100
AcDbRegAppTableRecord
  2
AUDIT_I_190703115940-0
 70
     0
  0
APPID
  5
2AE9
330
9
100
AcDbSymbolTableRecord
100
AcDbRegAppTableRecord
  2
AT_JNT_⸰ె⸰ెᖳ껀풴۬锼䃭칀۬��
 70
     0
  0
APPID
  5
2AEA
330
9
100
AcDbSymbolTableRecord
100
AcDbRegAppTableRecord
  2
AT_JNT_﵈䂾﵈䂾ᖳ껀풴۬㺠䂪칀۬��
 70
     0
  0
APPID
  5
2AEB
330
9
100
AcDbSymbolTableRecord
100
AcDbRegAppTableRecord
  2
AT_JNT_⾙츰۬ᖳ껀풴۬㵠䂪칀۬��
 70
     0
  0
APPID
  5
2AEC
330
9
100
AcDbSymbolTableRecord
100
AcDbRegAppTableRecord
  2

I'm not a Developer, I'm a CAD User which uses FreeSoftware at home. I'm not allowed to provide the DWG or DXF of the file. But I'm willing to follow advises If you need me doing things to find the errors.

Environment:

• Windows 10 / libredwg-0.13.3.7345-win64 (AutoCAD 2025 for test of DXF)
• AutoCAD audit say dwg is without error.
• File from AutoCAD 2019
• Has Proxy Objects from AutoPlant (3D)
• The DWG File itself contains several xref which them selves containing xref (in total 80) and has a Layout with viewport.
• Important for me at the end is everything 3D
• the resulting DXF has 40MB

[rurban]

Without the XX1704-LAY-0900-P11628.dwg we cannot help.

The Invalid BLOCK_HEADER.preview_size 538976288 error was just fixed recently. It corrupted the whole object

[Mannshoch]

Sorry, I'm not allowed to provide the DWG or DXF of the file. But I'm willing to follow advises If you need me doing things to find the errors.