There are really many plugins that use the Ctrl keys for shortcuts. To find them, you will need to search / search through each of the binding files of your plugins to check which conflicting bindings interfere with your setup.
You can do this with this plugin and remove key bindings that you don't need. However, they are likely to reappear in the updated plugin update.
Alternatively, you can try to override the original command by setting:
{ "keys": ["Ctrl+\["] }
and following this by setting the appropriate key binding from the Vintage package.
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