I've seen the flipping on the side of the head of a bed and of a door. The west-facing side of the door has the correct texture, but the east side is mirrored. The north-facing side of the head of the bed is mirrored, but the south-facing side is fine.
I only searched "mesa" and looked at a few bug reports, which was, I s'pose, why I didn't find the duplicate report. Thanks for the help.
David:
The fact that Fix Version says 1.8 is inconclusive, because there is no 1.7.3 in the versions list, only 1.8, with a question mark after it (https://mojang.atlassian.net/browse/MC#selectedTab=com.atlassian.jira.plugin.system.project%3Aversions-panel). If any changes are going to occur in 1.7.3 rather than 1.8, we won't find it out from the bug tracker. I think it's more likely, especially because of the question mark, that "1.8?" is just a placeholder for whatever the next version is going to be, and this fix will occur in 1.7.3. I got that impression from someone, I don't remember who.