It has come to my attention (thanks @Kzz) that the recent clean up of session saving and presets has resulted in a slight issue with previously saved sessions. So if you exported a plugin and have been using it in saved DAW sessions, but then decide to overwrite the plugin with an update, the DAW will no longer correctly load the last saved state of the plugin.
If you need to prepare an update of a plugin the best thing to do would be to call it version 2 and have users place it beside the older version. Otherwise explain that they will need to re-save all their plugins parameter data when it loads in the session.
Apologies for any headaches caused, but I’m reluctant to roll back the clock on this change as the code is far more robust now, and will be much easier to maintain for the future.