After speaking with Ableton, they have confirmed the issue is on their end and have rolled out a fix in version 10.0.3. Please update to 10.0.3 or higher available in your Ableton account.
The bug fixes that affect us directly are:
• Fixed some issues with VST and AU plug-in parameters, particularly where unconfigured parameters were heavily adjusted within the plug-in.
• Fixed a bug which prevented AU presets from recalling parameters correctly.