Yes and yes,
Kit from OcUK. It worked perfectly at the EXPO setting for a good few hours.
Code:G.Skill Trident Z5 Neo EXPO RGB 32GB (2x16GB) DDR5 PC5-48000C30 6000MHz Dual Channel Kit
If it was me I wouldnt accept that they dont work at expo.
I would send them back. My Corsair CL30 6000 work perfect so can recommend those.
Ram on new boards cant take time for them to dial in all the bioses.
set ram manually may work better for a number of reasons.
I tweaked with Buildzoids video he made.
but the early versions of my board bioses didnt allow me 6000mhz (stuck at 5800mhz).
then a bios came out that allowed same settings and 6000mhz.
hardware for pc have so many options so takes time to mature overall
(ram can be faulty anyhow but it may not be)