When I have a partitioned asset and accompanying job the job will launch fine from dagit. When I click on rematerialize asset in the graph overview no partition definition is selected - and the task then fails. This. is also true from the asset details page. I am working with a multiasset here. But I would expect this to work fine.

does the config modal show up for you? if so, you're experiencing the same problem that I did here: https://github.com/dagster-io/dagster/issues/8810. we'll fix this in Thursday's release

yes seems to be the same thing. No config needed, the model shows up but the partition selector is missing.