Module.getExportByName must use full path name for custom loaded library

[huan]

I have the following dynamic library files under Linux:

huan@dev:~/wechaty/sidecar-demos$ ls -l src/libfactorial.so 
-rw-rw-r-- 1 huan huan 15648 Jul 17 15:06 src/libfactorial.so
huan@dev:~/wechaty/sidecar-demos$ LD_PRELOAD=./src/libfactorial.so frida /bin/cat 
     ____
    / _  |   Frida 14.2.18 - A world-class dynamic instrumentation toolkit
   | (_| |
    > _  |   Commands:
   /_/ |_|       help      -> Displays the help system
   . . . .       object?   -> Display information about 'object'
   . . . .       exit/quit -> Exit
   . . . .
   . . . .   More info at https://frida.re/docs/home/
Spawned `/bin/cat`. Use %resume to let the main thread start executing! 
[Local::cat]-> Process.enumerateModulesSync().map(x => x.name)
[
    "cat",
    "libfactorial.so",
    ...,
]
[Local::cat]-> Module.getExportByName('libfactorial.so', 'factorial')
Error: libfactorial.so: unable to find export 'factorial'
    at value (frida/runtime/core.js:194)
[Local::cat]-> Module.getExportByName('/home/huan/wechaty/sidecar-demos/src/libfactorial.so', 'factorial')
"0x7fa2494630f9"
[Local::cat]-> Module.getExportByName(null, 'factorial')
"0x7fa2494630f9"
[Local::cat]->

Result

1. Module.getExportByName('libfactorial.so', 'factorial')

Error: libfactorial.so: unable to find export 'factorial' at value (frida/runtime/core.js:194)

2. Module.getExportByName('/home/huan/wechaty/sidecar-demos/src/libfactorial.so', 'factorial')

"0x7fa2494630f9"

3. Module.getExportByName(null, 'factorial')

"0x7fa2494630f9"

I would like to expect all the above three calls will return to the right address.

Does this expected, or it should be treated as a bug?