As the title says, KDE Partition Manager apparently sets several flags on newly created GPT partitions, among them a "Hide from EFI" flag, which made me spend a few hours today trying to figure out why my computer happily boots from a live USB, but doesn't see the EFI system partition I created... gdisk reports this as Attribute flags: 8066000000000003 Going to gdisk's "extra functionality" and accessing the "set attributes" menu lists the flags as 0 (system partition) 1 (hide from EFI) 49 (Undefined bit #49) 50 (Undefined bit #50) 53 (Undefined bit #53) 54 (Undefined bit #54) 63 (do not automount) To my knowledge, KPM is the only tool doing that. Partitions created with gdisk have absolutely no flags set, and while I have not checked gparted explicitly, I have never had problems with unfindable EFI system partitions when I used gparted. Please don't set any flags by default or at least provide an option to turn this behavior off and/or to edit the flags. The live USB that I used to create the EFI system partition was a custom Debian Sid image built a few days ago with KPM 21.08.0, but I've also confirmed this behavior on a newly installed Arch system with KPM 21.08.3.
I think this was fixed two months ago (so will be in 21.12) https://invent.kde.org/system/kpmcore/-/merge_requests/29 We didn't deliberately set attributes, but that field was not initialized and I guess contains random garbage.