"Permission denied" from dired, but not from ido completion in tramp

[Philipp Middendorf]

Hi,

I have a strange "permission denied" situation with tramp. When I connect to a 
remote host via "/ssh:host:/foo/bar/baz" I can access "/foo/bar/baz" just fine. 

However, if I navigate to "/ssh:host:/foo/bar" (one directory above "baz"!) and 
then, from dired, open "baz", tramp tells me "Permission denied".

I have enabled traces, and looked at the debug buffer. I'm not sure what to 
look for here, but the last entries are basically tramp trying to get the "True 
name" of "baz" (which works fine), and then:

07:59:21.468396 tramp-sh-handle-file-truename (4) # True name of 
‘/foo/bar/baz/’ is ‘/foo/bar/baz’
07:59:21.478967 tramp-handle-access-file (1) # Cannot access file or directory: 
Reading directory: Permission denied, /ssh:host:/foo/bar/baz/
(("‘/foo/bar/baz’") 7 ("fsdata" . 26666) ("fsdata" . 6666) 1718283606 
1717764465 1717764465 4096 "dr-xr-x---" t 9195275107 -1)

How can I dig deeper into this? If I navigate into "/foo/bar/baz" directly 
(which, again, works fine), and then go to "/foo/bar/baz/qux", I get 
"permission denied" again.

Is tramp "checking more things" or "doing something different" when going step 
by step via dired to a directory vs. going there directly from the minibuffer?

Cheers
Philipp