Description:
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The intl extension reports the Unicode ellipsis character (U+2026) to be a punctuation. PCRE matches the ellipsis when matching letters but not when matching punctuation. So the character class for the ellipsis differs between the intl extension and PCRE. I think that intl is correct here and the character class should be punctuation. But both extensions should at least agree on the same character class.

Test script:
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var_dump(IntlChar::ispunct("\u{2026}")); // true
var_dump(IntlChar::isalpha("\u{2026}")); // false

var_dump(preg_match('/\\p{Z}/', "\u{2026}")); // 0 (but would expect 1)
var_dump(preg_match('/\\p{L}/', "\u{2026}")); // 1 (but would expect 0)

Expected result:
----------------
bool(true)
bool(false)
int(1)
int(0)

Actual result:
--------------
bool(true)
bool(false)
int(0)
int(1)