No idea what the story behind this is. It’s a single gang coax box, and just a hole next to it. Looks like previous owner started to patch the drywall by putting the backer in but gave up.
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I had to deal with this exact situation, installing the backer myself (those stirring sticks from the hardware store are choice when doubled)… getting the texture right is a righteous pita.
If I had to do this again, a cheat might be something like a two gang plate but one is blank:
Those blank combo plates are a lifesaver for weird situations lke this - Arlington makes a low voltage mounting bracket that would work perfectly with that hole size too without needing to match texture.