I read the release notes and they said something like this:
"carpets are able to be placed on transparent blocks like glass"
So, I was testing and found carpets are easily and quite annoyingly able to be placed on other carpets which is a huge pain when quickly placing them.
Duplicate of MC-17833, please use the search function to see if your bug has already been submitted. Currently over 56% of tickets are being closed as duplicate.