The problem is that the chr(4) inside your /chr(4)/ regex is not being interpreted as a function call; rather it is being interpreted literally, with the parens in chr(4) being interpreted as regex metacharacters to capture the 4 in a matching chr4, for example!
There are a number of ways to fix this, for example:
@LineDetails = split /\04/, $line; # ... or
@LineDetails = split chr(4), $line;
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