Original post at http://lists.macromates.com/textmate/2016-July/039633.html
Is this a local HFS+ file system?

Unfortunately not, its a samba share, and a continuation of the long-running problems I've been having developing with TM over SMB 

And just to be sure I understand this correctly, when you do open file A, and file B opens, the proxy icon / title bar etc. will point to B, right?

These are the symptoms I'm seeing, yes. 
I've since noticed this only happens after getting an Atomic File Save failure, so its all kinda linked back into the original problem I was having with Atomic Save failures, the difference is I;ve since tried to reconfigure SMB a bit

Restarting TM does not fix it, nor does restarting samba server.
Unmounting the share from OSX and remounting it, does fix it.

The dilemma is I've yet to see the same issue using other editors like Atom, nor do I think TM is doing anything it shouldn't be 
For whatever reason though, the combination of atomic saves over an SMB share just doesn't seem reliable for me

I plan to try and branch TM to disable Atomic Saves for certain paths (like /Volumes/*)
I've dug through the source a little, but this change doesn't seem trivial, so any gotcha's or pointers would be appreciated

Anyone who is using TM over a SMB share, and not seeing this issue, I'd really love to hear from you!