There's been some discussion recently of the idea that Betelgeuse could go supernova in a matter of decades (not certain at all, see the link below). Since it's hundreds of lightyears away, that would raise the possibility that it could already have gone supernova in the past and the light just hasn't reached us yet.

When situations like this come up, people sometimes want to quibble about whether to talk about the event as being in the past or the future. But an interesting facet of relativity is that in a situation like that the event has a "spacelike separation" from our current moment, and whether it is in the past or the future is a matter of perspective; observers at our current position and instant in time will disagree about whether the hypothetical supernova event is in the past or the future if they have sufficiently different velocities.

By contrast, events in our past light cone (whose light could already have reached us) lie unambiguously in the past; all observers agree they happened at an earlier time regardless of their velocity. All events in our future light cone (events to which we could still send light signals) lie unambiguously in our future. These two classes of events have "timelike separation" from the here and now. But the timing of spacelike separated events is a matter of perspective, and in some sense they can be thought of as lying neither in the past nor the future.

In any case, I always find it silly to quibble about the wording for these cases in casual conversation. Everyday English doesn't really contain the words you need to capture the situation without turning to physics jargon.

https://www.universetoday.com/161751/betelgeuse-is-almost-50-brighter-than-normal-whats-going-on/