PjRtFutures & Async Computations issue

[qingliz]

What's the behavior expected when interacting with PjRtFutures and Async computations? For example at https://github.com/openxla/xla/blob/main/xla/python/pjrt_ifrt/pjrt_executable.cc#L604-L612 we made sure the pjrt_futures are successfully returned and set, and was expecting the XLA layer would handle the joint status, for example when pluggable device set the future an error, however it doesn't and looks like the joint status is not used at anywhere down further.

Does XLA expect pluggable device to handle the PjRtFuture itself, especially the async computation error handling, or this is bug/TODO on XLA side?