When executing symfony server:start without the -d switch, I can see the logs correctly. But when running symfony server:log in another terminal (or with the server started with the -d switch), the only output is:

Tailing Web Server log file (/home/arnaud/.symfony5/log/741ad4550b0018165e0552aeeb2c5405c7961120.log)
Tailing PHP log file (/home/arnaud/.symfony5/log/741ad4550b0018165e0552aeeb2c5405c7961120/7daf403c7589f4927632ed3b6af762a992f09b78.log)

I can manually tail the said files but it's not very convenient. The "tailing" message is confusing because the log files are not tailed but only the new lines are sent to stdout. Tailing for real the logs like what the server:start command does would be helpful.