On an event, I modified the Pan/Crop and added "Deform" to fix a slightly off-center camera.
When Saving the Plug-In Chain as a Filter Package, an error box came up saying "File not saved: Plug-In Package" (and the chain didn't save in "Filter Packages").
Meanwhile, the FX chain presets created by VP23 no longer supports DXT video FX (such as those FX that look very old).
Deform is a DXT plugin, so it cannot be saved by the FX chain feature of VP23.
I think an alternative method is to add it to an adjustment event and when you need it, open the old project containing the adjustment event and copy & paste it into the new project.
I'm not very fond of the FX chain feature of VP23 and hope Magix will change it back.