It does, just maybe not in your accent.
Example: "comment and post" for "eat toast".
for example too (for a single word example)
My Canadian ear somehow corrects the "pork" and "talk" so that they still don't quite rhyme (though they're certainly close enough for slant rhyme)
I hear the "r" in pork even if it's less audible than it would be in my English. And the "a" in talk sounds a little more like the "a" I'm familiar with from talk than the "o" in pork does.
Most of these accents have a rhotic r but not a rhotic (lotic?) l in this position.
1. The "r" in pork is pronounced in most American accents,
2. The vowel is not the same.