iris saver issue (via Dask delayed) with dask==2025.4.0 and 2025.4.1 - fixed in iris=3.12.2

[valeriupredoi]

See failed test, the issue is a change of API after switching to Dask 2025.4.0:

>       self.delayed_completion().compute()
E       AttributeError: 'tuple' object has no attribute 'compute'

I am onto it now 🍺

[valeriupredoi]

Same issue with dask=2025.4.1

[valeriupredoi]

fixed in iris 3.12.2 just released (patch) SciTools/iris#6417