On MOD Desktop, External UI doesn't open for some LV2 plugins

I mean if there’s something particular about LSP plugins that makes them not work, while others do, so it’s easier to pick good candidates for testing.

So I assume every plugin that comes attached with it’s own gui gets the icon displayed.
Some show up and some don’t and I’m wondering what to look for in the plugins that might work out of the box.
However, a full technical answer might be too advanced for me anyway.

I hope you’ll be able to get it working. Thanks!