Bicep plugin issues

I've been using Rider to author bicep projects quite satisfactorily but find to get the LSP feature to work I enable it then it just flags all the bicep as full of errors (when it's not), so I download the langserver zip from the bicep repo on github and overwrite the contents of %userprofile%\AppData\Local\JetBrains\Rider2026.1\bicep\bicep-langserver with the zip contents then everything has then worked fine.

Except upgrading from 2025.* to 2026.1.2, F12 go to declaration is broken on local module path declarations e.g 
module '../../modules/my-module/main.bicep' = ...

The tooltip error simply say “Cannot find declaration to go to” - this happens with the default plugin and langserver install.
No debug traces or log entries observed/found related to this error.