Hello,

Running the partitionning tool on TW in expert mode in order to create my
custom partition layout.

I added a new partition /boot/efi (would be nice to be able to select /boot
BTW) to be used as ESP. I assumed that the installer would detect this and
would automatically use the appropriate typecode for ESP since there's no way
to manually select the typecode of a partition manually.

However it selected "0700" which means "Microsoft basic data" !

Fortunately my system booted just fine.