Rename Variables does not work for Variables exported as Token Sets

[keeganedwin]

Describe the bug
After exporting variables as Token Sets, and then attempting to rename the variables from the plugin does not work. This feature however does work if variables are exported as themes. In the example in the video, I export a group of sizing tokens named Size group, and then attempt to rename the variable after changing the name in the plugin to Sizegroup, this does not work. Even if I re-export it with the Update existing style and variable names option, it creates a new group of variables instead.

To Reproduce
Steps to reproduce the behavior:

1. Create sizing tokens named Size group.size_1 and Size group.size_1
2. Export the variables as Token sets
3. Rename Size group to Sizegroup
4. Select the Rename variable option in the plugin
5. See error
6. Export variables as token sets with Update existing style and variable names option
7. See error again

Expected behavior
Plugin should rename the variable just as it does with variables exported as themes.

Screenshots or Screencasts
Recording