OSX Server webdav bug? - files and folders disappears when filenames are fewer than 7 characters

OSX Server webdav bug? - files and folders disappears when filenames are fewer than 7 characters
Dear Community,
i have a BIG problem with Apple webdav.
All files or folders with fewer than 7 characters in filename disappear.
The problems is only between Mac Server and Mac Clients
and exists since OSX Server 1 (Server 10.7, 10.8, 10.9) on ALL Macs i know.
The problem persist ever and occurs in the following settings:
Mac Server (1.x, 2.x, 3.x) <> Mac Clients (10.7.x, 10.8.x, 10.9.x, 10.6 not tested)
The problem does NOT occur in the following settings:
Mac Server <> Windows Clients
Mac Server <> Linux Clients
Linux Server (my Webhoster) <> Mac Clients
Windows Server (my Webhoster) <> Mac Clients
So i think it is not a problem with server itselv or a single client only,
it is probaly a problem with the combination betwen mac servers and mac clients.
This is NOT a problem with MY MacServers/Clients only and not with only one Server.
It occurs in many different Places and many different Machines.
I have contact Apple Support more then tree times (always when i setup a new machine with server.app)
but she said they heard first time about that and she cannot reproduce that problem.
please, can somebody try it out?
sorry for my bad englisch.
best regards
rené

Supplement note:
The Problem occurs also between OSX Server <> OpenWRT (Linux)
best regards
rené

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