In the movie 7 Seconds (2005). the Russian character Alexsie Kutchinov (played by Pete Lee-Wilson) says:
 
“We have a saying in my country: ‘Don’t blame the baker when the butcher bakes the bread.’”
 
The saying means that there are specialists (such as a baker and a butcher), and you shouldn’t expect a specialist to be competent outside of that specialty. The saying was first cited in this film and does not appear to come from Russia or anywhere else. The screenwriter was Martin Wheeler.
 
         
Wikipedia: 7 Seconds (film)
7 Seconds is a 2005 American crime action thriller film directed by Simon Fellows and starring Wesley Snipes and Tamzin Outhwaite. The film was released on Direct-to-DVD in the United States on June 28, 2005. The title refers to the timers at the beginning of the film, which are set at 00:07 (7 seconds).
 
IMDb (The Internet Movie Database)
7 Seconds (2005 Video)
Quotes
Alexsie Kutchinov: We have a saying in my country - don’t blame the baker, when the butcher bakes the bread.
John Tuliver: What the hell does that mean?
Alexsie Kutchinov: It means you’re fucked.
 
Springfield! Springfield!
7 Seconds (2005) Movie Script
(...)
Alexsie Kutchinov (played by Pete Lee-Wilson): “So, So, Tuliver. We have a saying in my country: ‘Don’t blame the baker when the butcher bakes the bread.’”
John Tuliver (played by Wesley Snipes): “What the hell does that mean?”
Alexsie Kutchinov: “It means you are fucked.”
 
Twitter
shopgirl
@xo_ana
Dont blame the baker when the butcher bakes the bread. Wtf does that even mean!?
3:10 AM · Apr 28, 2009·Twitter SMS
     
Twitter
Arch Valenz
@ArchValenz
Don’t blame the baker if the butcher bakes your bread.
7:45 PM · May 5, 2009·Twitter Web Client
 
Twitter
Manda
@__yall_lame_af
Re: dnt blame the baker.. When the butcher bakes the bread.
...
3:05 AM · Sep 9, 2009·Twitter SMS
   
Twitter
Dexter Foster
@DexterIX9
Dont blame the baker when the butcher bakes the bread.
3:05 AM · Dec 2, 2009·Twitter SMS
   
Google Books
When Beauty Fades:
Make Hay While the Sun Shines
By Clement U. Ewulum
Bloomington, IN: AuthorHouse UK Ltd.
2013
Pg. 31:
But aunty remember o, never blame the baker when the butcher bakes the bread.
 
Twitter
Mtimkulu Karabo
@kscrIpts_
“We have a saying in my country, don’t blame the baker, when the butcher bakes the bread”
5:08 AM · Apr 9, 2013·UberSocial for BlackBerry
   
Twitter
Tee Mashawi
@HermannMashawi
Replying to @thesignalng
“don’t blame the baker when the butcher bakes bread” a certain country man once said
8:38 AM · Sep 3, 2019·Twitter for Android
 
Twitter
Shakespeares’ Son
@RealBeefactor
Replying to @tinzweiwo @Mavhure and 3 others
I ain’t a President. I ain’t in charge of any Country. The biggest mistake one would make is to blame the baker when the butcher man bakes bread.
I hope you understand.
8:17 AM · Nov 2, 2019·Twitter for Android