MAX_TIMESTAMP_LOOKAHEAD is relative to the position determined by TIME_PREFIX , so the initial setting of 32 should not have been too low to be valid.
MAX_TIMESTAMP_LOOKAHEAD = <integer>
* Specifies how far (in characters) into an event Splunk should look for a
timestamp.
* This constraint to timestamp extraction is applied from the point of the
TIME_PREFIX-set location.
* For example, if TIME_PREFIX positions a location 11 characters into the
event, and MAX_TIMESTAMP_LOOKAHEAD is set to 10, timestamp extraction will
be constrained to characters 11 through 20.
* If set to 0, or -1, the length constraint for timestamp recognition is
effectively disabled. This can have negative performance implications
which scale with the length of input lines (or with event size when
LINE_BREAKER is redefined for event splitting).
* Defaults to 150 (characters).
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