`Copy` is not being derived when referring to a blocklisted type

I am using blocklist_file to control which items go into which generated binding files, and I manually add the imports so everything compiles fine.
The issue is that when a struct references another type that has been blocklisted it doesn't add a #[derive(Copy)] to that type.

An example:

// This works fine:
#[repr(C)]
#[derive(Debug, Copy, Clone)]
pub struct xcb_input_device_key_state_notify_event_t {
    pub response_type: u8,
    pub device_id: u8,
    pub sequence: u16,
    pub keys: [u8; 28usize],
}

// This doesn't:
#[repr(C)]
pub struct xcb_input_change_device_notify_event_t {
    pub response_type: u8,
    pub device_id: u8,
    pub sequence: u16,
    pub time: xcb_timestamp_t, // this is a type alias to u32 which is defined in a header that has been block-listed while generating the bindings for that file
    pub request: u8,
    pub pad0: [u8; 23usize],
}

Is this intended behavior? Is there a workaround?

Start by reproducing the blocklist_file case with the two structs shown, then trace how bindgen decides whether generated structs receive Copy and Clone derives when a referenced type is blocklisted. Done means the affected struct derives Copy consistently, with a regression test covering the blocklisted type alias scenario.