See attachment for sample JSON.
sample.log
Lines 1 & 3 are processed & displayed properly.
Line 2 isn't processed at all and is put as a whole into the very last column ("SpanId" in that case)
Line 3 is a copy of Line 2 with the properties level, Classname, Methodname, Thread, SourceLineNumber & CorrelationId removed.
Found in LogExpert v1.20.0