Your events are already single line events, so to remove debug of the line breaker, I explicitly set break each line and was able to extract the timestamp with:
Update: added landen99's line breaker suggestion below in case you absolutely have to have it and this props still working for me....
[ splunk_answers_timestamp ]
SHOULD_LINEMERGE = false
NO_BINARY_CHECK = true
BREAK_ONLY_BEFORE = ^\[\d+\]\[\d+
TIME_FORMAT = %m/%d/%Y][%H:%M:%S.%3N
TIME_PREFIX = ^\[\d+\]\[\d+\]\[
TZ = America/New_York
KV_MODE = none
MAX_TIMESTAMP_LOOKAHEAD=75
I think perhaps you were't accounting for what chars would be left after your line breaker and time prefix....also not sure if you escaped everything you needed to...
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