Theme install sends intro errors out of the terminal
A change merged into quattro sends a theme install's intro output to /dev/null, after that error printed in the terminal once the command had finished. The boot intro keeps its output.
Installing a theme printed an intro error in the terminal after the line that tells you to press any key to close. The intro runs in a background subshell that inherits the terminal, so the error landed after the command had finished. A change merged into quattro sends that output to /dev/null.
The call only matters for its exit status. The boot intro, run from the shell, keeps its output for logs.