There's no error here. Everything acts normally.
The OP just has another document in sRGB, with the sRGB profile embedded. He's pasting into that. We don't know where that came from, but it just happens to be an sRGB file.
Again, the working space plays no part in any of this. Any file coming out of ACR already has a profile, set in the ACR workflow options. Here it's Adobe RGB. The file from ACR opens into Photoshop with that profile, regardless of what the working space is.
The mismatch dialog is a nuisance, and I've always kept it off. It doesn't tell you anything useful. Much better to set the notification area as above, this way you always know at a glance what color space any file is in.
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