LV2: stateChanged not triggered on UI side when using requestFileState file dialog

[eventual-recluse]

I'm testing a plugin in which the user can load settings from a file, using a file dialog invoked by requestFileState. The file name is displayed when chosen (similar to the FileHandling example plugin).

Everything works fine in the VST3 build, and the file name is displayed immediately.

However, in LV2, the file name is not displayed until the UI is closed and ropened.

On investigation, I found that stateChanged method is not triggered in the UI when the file is chosen in the file dialog in LV2 ( but closing and opening the UI causes it to be triggered).

The example fileHandling LV2 plugin shows the same behavior too.