I think that the problem here is that the plugin is converting the datetime from the two filter in image below to the timezone from server while the graph is defined in timezone from local browser generating to the user a bit of confusion in time define alert rules.

I verified it because my sever is configured in GMT-0 while my browser is in GMT-3 and the result in query is a graph forwarded 3h in future.
Grafana 10.0.3 running in Docker container
Ubuntu 22.04.3
I think that the problem here is that the plugin is converting the datetime from the two filter in image below to the timezone from server while the graph is defined in timezone from local browser generating to the user a bit of confusion in time define alert rules.
I verified it because my sever is configured in GMT-0 while my browser is in GMT-3 and the result in query is a graph forwarded 3h in future.
Grafana 10.0.3 running in Docker container
Ubuntu 22.04.3