LD_PRELOAD inconsitency

[Reco]

        Hello, list.

It got my attention today (current jessie, amd64):

$ LD_PRELOAD=libproxychains.so.3 mutt

ERROR: ld.so: object 'libproxychains.so.3' from LD_PRELOAD cannot be
preloaded (cannot open shared object file): ignored.

but,

$ LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libproxychains.so.3 mutt

<works as intended>

and

$ LD_PRELOAD=libproxychains.so.3 ls

<works as intended>

So, the question is: what makes mutt so special?

Reco