I can confirm that there is no blacklisting. I think it may have to do with the REGEX for reporting the message, but I have no REGEX knowledge/experience.
I'm seeing this in SPLUNK_HOME/etc/system/default/props.conf:
[source::WinEventLog...]
SHOULD_LINEMERGE = false
MAX_TIMESTAMP_LOOKAHEAD=30
LINE_BREAKER = ([\r\n](?=\d{2}/\d{2}/\d{2,4} \d{2}:\d{2}:\d{2} [aApPmM]{2}))
**REPORT-MESSAGE = wel-message, wel-eq-kv, wel-col-kv**
KV_MODE=none
TRANSFORMS-FIELDS = strip-winevt-linebreaker
and in transforms.conf:
**[wel-message]**
REGEX = (?sm)^(?<_pre_msg>.+)\nMessage=(?.+)$
CLEAN_KEYS = false
**[wel-eq-kv]**
SOURCE_KEY = _pre_msg
DELIMS = "\n","="
MV_ADD = true
**[wel-col-kv]**
SOURCE_KEY = Message
REGEX = \n([^:\n\r]+):[ \t]++([^\n]*)
FORMAT = $1::$2
MV_ADD = true
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