Can you be a bit more specific on the issue, because I am not sure I fully understand the problem. To me, it reads as follows:
> with Catalyst 13.1, the "Vibrance" option is available, and enabled by default
> with Catalyst 13.4, the "Vibrance" option is available, and disabled by default.
If the above is what you mean, I would suggest that perhaps the development team chose to disable it by default going forward. If you want to use it, just enable it.
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