Unverified development snapshot?

I downloaded the last development snapshot from Swift.org - Download Swift, but, unlike the other snapshots, this one shows the following prompt when you try to run the .pkg:

The translation is the following:

Unable to open "swift-DEV..." because Apple cannot verify malware presence.
A software update is required...

It's the first time I'm seeing this prompt when installing a development snapshot. I'm running Big Sur 11.3.1 (20E241).

I don't have an answer, but for what it's worth, I just downloaded that same snapshot (swift-DEVELOPMENT-SNAPSHOT-2021-05-12-a-osx) and installed it without issue. Same OS version as you (Big Sur 11.3.1)

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