[6.10.0-rc8] RSA and DSA SSH keys do not work

i have no issues in 6.9.2 but as soon as i upgraded to 6.10.0-rc4 i started having this issue.

Trying to connect to SSH via Putty gives me this error

Using username "root".
Server refused our key
Keyboard-interactive authentication prompts from server:
| Password:

I tried twice recreating the private/public key pairs in puttygen, changing the .ssh/authorized_keys file in unraid, and changing the auth in Putty on my PC.

No change.

I've tried to change the authorized keys field in the root user but it always tells me the syntax is incorrect.

the key has no line breaks and there is a space between ssh-rsa and AAAA