When running the following script in bash, i get an 0d 20 prefix to the actual result:

sql -thin -S -L user/pw@connect <<EOF
set heading off
set feedback off
set pages 0
select max(to_number("version")) from "schema_version";
EOF

Using exactly the same script with sqlplus, everything is fine.
This happens both on Linux as well as on Windows, running
SQLcl: Release 25.1.0.0 Production Build: 25.1.0.101.2353

From the timing of the output my guess is that it happens during startup, as 0d 20 appeare some time before the printout of the version number.

Any hints?