Path returned by `which` depends on CWD contents

[tiymat]

Describe the bug:

[~] > g cat
Error in `g` (0,1): no data returned
[~] > which cat
cat => (/usr/bin/cat) cat - concatenate files and print on the standard output
[~] > touch cat
[~] > which cat
cat => (cat) cat - concatenate files and print on the standard output

Note the change from /usr/bin/cat when there's no cat file in CWD to cat when there is.

Expected behaviour:
/usr/bin/cat is printed, regardless of CWD contents.

Screenshots:
N/A

Platform (please complete the following information):

• OS, output from uname -a if supported: 7.0.11-arch1-1
• Terminal Emulator: kitty 0.47.1
• Murex version, output from version --no-app-name: 7.2.1001 (unknown)

Additional context
Should regular files not on $PATH even be returned by which at all? If so, should the absolute path be returned, or the path relative to CWD?