It's a special case and I don't think it is a problem in practice. It only happens when there is a block longer than $subStrSize (the minimum match quanta) with a repeated pattern. Test strings and results are shown below:
>string1
01010101010ddddddddddd01234566789a12345yy
>string2
0123456789b12345eeeeeeeeeeeex01010101010x
>string3
0123456789c12345ffffffffffff01010101010zz
000:001 L[ 11] ( 0 29)
000:002 L[ 11] ( 0 28)
001:002 L[ 10] ( 0 0)
Completed in 0.002126
Best match: >string1 - >string2. 11 characters starting at 0 and 29.
Best match: >string1 - >string3. 11 characters starting at 0 and 28.
Perl is Huffman encoded by design.
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