Sorry, i was unprecise, try 

$ touch /tmp/test.txt
$ gmni -D /tmp/test.txt gemini://geminispace.info
$ head /tmp/test.txt

or alternatively

$ gmnlm gemini://geminispace.info

...

[N]: follow Nth link; [b]ack; [q]uit; [?]; or type a URL
=> d
Downloading gemini://geminispace.info to ./geminispace.info
Error: read

Requesting an URI without saving it to storage works fine.

Regards René

Are you on a system which uses LibreSSL?

Nope, currently installed is:
local/openssl 1.1.1.l-1
local/libretls 3.4.1-1

It's basically plain Arch, last openssl update 
dates back to early September.

I'm not sure when it broke, but i know for sure
that it worked someday.