https://secure.phabricator.com/diffusion/symbol/getLinterName/?lang=php&repositories=PHID-REPO-08d9fc47cf397db6ce83%2C[object%20Object]&jump=true

[object%20Object] should not be there. See (2).

https://secure.phabricator.com/diffusion/symbol/getLinterName/?lang=php&repositories=PHID-REPO-08d9fc47cf397db6ce83&jump=true

That's actually the PHID for rPHU, so it's correct in not finding anything. Using the PHID for rARC works as expected:
https://secure.phabricator.com/diffusion/symbol/getLinterName/?lang=php&repositories=PHID-REPO-7549473b706cf5093dbf

So I guess the issue with (1) is that the PHID for rARC is somehow replaced with [object%20Object].

This partially works, i.e. symbols are shown, but! the last result is from rP:
https://secure.phabricator.com/diffusion/symbol/getLinterName/?lang=php&repositories=rARC&jump=true

I think repositories field only expects PHIDs, so it ignores this content; It then falls back to searching in all repositories, which sorts of makes sense.

So probably the only issue here is that [object%20Object] thing.

For example:

1. Open https://secure.phabricator.com/diffusion/P/browse/master/src/applications/arcanist/conduit/ArcanistConduitAPIMethod.php
2. Cmd+click on ConduitAPIMethod
3. Get "No matching symbol could be found in any indexed repository."

Thanks, that's very helpful.