Episerver Forms fails to load

After upgrading to CMS 11.11.2 we run into an exception on startup:

Did not find a module by assembly 'EPiServer.Forms.Core, Version=4.23.0.0, Culture=neutral, PublicKeyToken=8fe83dea738b45b7'

Looking at the stack trace, it seems it's trying to find a module based on the EPiServer.Forms.Core assembly in:

EPiServer.Shell.Paths.ToClientResource(Assembly moduleAssembly, String moduleRelativeClientResourcePath)

This seems odd to me, I figured the only modules that should be loaded are EPiServer.Forms and EPiServer.Forms.UI?

Here is the <episerver.shell> element in web.config:

<episerver.shell><publicModules rootPath="~/modules/"></publicModules><protectedModules rootPath="~/EPiServer/"><add name="Shell" /><add name="CMS" /><add name="EPiServer.Forms.UI" /><add name="EPiServer.Forms" /></protectedModules></episerver.shell>

I've also tried adding autoDiscovery="Modules" to the <protectedModules> element, but that doesn't make any difference.

bin folder contains:

• EPiServer.Forms.dll
• EPiServer.Forms.Core.dll
• EPiServer.Forms.UI.dll

In desperation I've tried switching on/off the forced bin folder scan: <scanAssembly forceBinFolderScan="true" />, to no avail.

Looking at the logs, other modules seem to be loading fine.

I know there are other seemingly similar problems out there, but as far as I can tell they don't apply here.