Tried the latest ISO, garuda-dr460nized-linux-zen-241018.iso; both garuda assistant and garuda welcome are opaque. Dolphin worked fine.
Meanwhile, in my current installation, the absence of blur for dialog boxes is still present after garuda-update.
I think there might be either some misconfiguration or corrupted package on your installation.
If you can, try to create a new user and log in to Plasma with that user. If the issue persists, I would tend more towards corrupted package or something like that.
Make sure you have this config in your kvantum:
I think I played with some % values a looooong time ago but that won’t screw up the essence of the effects.
Kvantum Manager config is same as yours.
New user account:
There is blur if the dialog box is in focus, (I think it blurs the entire background); there is no blur when it is not in focus.
in focus:
not in focus:
Yes when in focus the background is unfocused and therefore is configured to blur and the effect is slightly seen through the dialog box which is transparent.
But yes when in focus there is no blur.
There is probably some kind of package missing or misconfigured on your installed system.
This is your kvantum package name and version?
[🧱] × paru -Qi kvantum
Name : kvantum
Version : 1.1.3-1
Yes
╰─λ paru -Qi kvantum
Name : kvantum
Version : 1.1.3-1
Description : SVG-based theme engine for Qt6 (including config tool and extra themes)
Architecture : x86_64
URL : https://github.com/tsujan/Kvantum
Licenses : GPL-3.0-or-later
Groups : None
Provides : None
Depends On : gcc-libs glibc libx11 kwindowsystem qt6-base qt6-svg
Optional Deps : kvantum-qt5: Qt5 style [installed]
Required By : garuda-dr460nized kvantum-qt5 plasma5-themes-sweet-full-git
Optional For : None
Conflicts With : None
Replaces : None
Installed Size : 8.14 MiB
Packager : Antonio Rojas <arojas@archlinux.org>
Build Date : Thu 24 Oct 2024 09:09:52 PM IST
Install Date : Sun 27 Oct 2024 10:52:42 AM IST
Install Reason : Explicitly installed
Install Script : No
Validated By : Signature
I must admit I am out of ideas to fix this without reinstalling from a Live ISO. 
I have restored the OS using snapper many times. Do you think that could have caused some package to “go rogue”?
That’s an interesting question.
Snapper is a great tool to restore ROOT (/) subvolume and get you out of most troubles, but it does not restore HOME (/home).
If you mess up, no matter how, your /home subvolume, snapper will not help.
That being said, in your case even creating a new user (which is basically what exists under /home) does not fix it.
Snapper is reliable to restore volumes but it is not impossible something went wrong during the restore process and corrupted one of your restores at some point. Snapper itself may not be the cause, but a simple CPU error, disk I/O error, RAM error, BTRFS error while restoring can cause huge issues or none at all. Earlier this week for some reason my CPU20 had a problem with some plasma libs and it caused many weird issues on my running system. I had to reboot and it’s working fine since. I thought it was my Firedragon being buggy but it was caused by hardware problem.
Yes it is possible the same happened to you during a restore process.
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