Can't add and remove certificates at the same request.

I have an ARM template I'm using to create a service fabric resource. I'm using it to set the client certificate and the admin client certificate. The ARM section in properties looks like this:

 "certificate": {
     "thumbprint": "[parameters('certificateThumbprint')]",
     "x509StoreName": "[parameters('certificateStoreValue')]"
 },
 "clientCertificateCommonNames": [],
 "clientCertificateThumbprints": [
     {
         "isAdmin": true,
         "certificateThumbprint": "[parameters('clientCertificateThumbprint')]";
     }
 ]

This use to work just fine, but now when I run it, I get this message:

 {
     "error": {
         "code": "CantAddAndRemoveCertificatesAtSameTime",
         "message": "Can't add and remove certificates at the same request.",
         "details": []
     }
 }

What changed?