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No ReFS option in 29641
When install OS using the ISO image of this new build, there is no ReFS filesystem selection as in build 29621, is there any change in Windows setup?
This is a known issue and will be fixed in an upcoming Insider preview build. I will share the build number as soon as it's confirmed. In the meantime as a workaround, you may also use setup unattend to configure ReFS boot on your systems: ReFS Boot Volume Setup for Windows Server (preview) | Microsoft Learn
You can still format the system volume with REFS using DISKPART. Hit Create Partition to have Windows create the three GPT partitions. Press <SHIFT><F10> to enter Command Prompt. Enter DISKPART. Select disk 0 (assuming that is your disk), select part 3, format fs=refs quick.
https://www.youtube.com/watch?v=31Nu_BD9AHo