I think your TIME_PREFIX is wrong. And my real question is this: what happens if you leave all that out and just let Splunk figure it out? This is a pretty common format, and I think Splunk might not need all of this. I might go as far as this in props.conf (on the indexer):
MAX_TIMESTAMP_LOOKAHEAD=25
SHOULD_LINEMERGE=false
Because that makes Splunk a bit more efficient, not because it is really necessary.
But if Splunk can't figure out the timestamp on its own, you could add:
TIME_FORMAT=%d%t%b%t%H:%M:%S
TIME_PREFIX=\[\d+]\s
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