gsmiller commented on issue #12451:
URL: https://github.com/apache/lucene/issues/12451#issuecomment-1644713373
I've tracked it down to this exact sequence being added:
U+65535 (0xef 0xbf 0xbf) followed by U+65536 (0xf0 0x90 0x80 0x80). Note
that these code points are immediately next to each other. If you change either
of them by one value down/up, the bug no longer exists. I have to step away now
but will try to spend more time on it soon.
You can reproduce this by adding the following code immediately after line
127 in `TestStringsToAutomaton`:
```
sorted = new ArrayList<BytesRef>();
sorted.add(new BytesRef(new byte[]{(byte) 0xef, (byte) 0xbf, (byte)
0xbf}));
sorted.add(new BytesRef(new byte[]{(byte) 0xf0, (byte) 0x90, (byte)
0x80, (byte) 0x80}));
```
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