"loop in destinations" not detected by preflight

The Bavaria testsuite requests to detect "Contains loops in destinations" in the attached file. I'm not sure what they mean, but PDF-Tools detects this and we don't:

The value of the key Prev is 212 0 R but must be 0 0 R.
The value of the key Prev is 214 0 R but must be 0 0 R.
The value of the key Prev is 215 0 R but must be 214 0 R.
The value of the key Prev is 213 0 R but must be 212 0 R.
The value of the key Prev is 217 0 R but must be 0 0 R.
The value of the key Prev is 218 0 R but must be 217 0 R.
The value of the key Prev is 219 0 R but must be 218 0 R.
The value of the key Prev is 216 0 R but must be 213 0 R.
The value of the key Prev is 220 0 R but must be 216 0 R.
The value of the key Prev is 222 0 R but must be 0 0 R.
The value of the key Prev is 223 0 R but must be 222 0 R.
The value of the key Prev is 224 0 R but must be 223 0 R.
The value of the key Prev is 221 0 R but must be 220 0 R.
The value of the key Prev is 226 0 R but must be 0 0 R.
The value of the key Prev is 225 0 R but must be 221 0 R.
The value of the key Prev is 211 0 R but must be 0 0 R.
The value of the key Prev is 210 0 R but must be 0 0 R.