Yes, it's a disappointing problem right now. I removed NIP-07 in the last release. I will add it back. The problem is that right now, all NIP-07 extensions that I am aware of does not support NIP-44 yet.

Actually, just checked, https://github.com/vitorpamplona/nips/blob/sealed-dms/07.md, NIP-07 should support NIP-44 now.

I will add it back in 3 hours.