Question regarding "Warning: synchronized as part of multiple folder pairs"

[The5]

I sync the input folder

D:/Assets/


to the output

NAS/MIRROR/Assets


However I want some of the file types in there to get versioned too, namely *.blend files. So I created 2 folder pairs for it, one with versioning and used the exclude settings to differentiate.
Blender also generates *.blend1, *.blend2 incremental save files, that I do not need to sync in either case and added to both excludes.

I have 2 folder pairs set up

A - ignore blend files, sync everything else:
  filter_include: *
  filter_exclude: *.blend? ; */models/*.blend ;


B - specific for blend files with versioning setting enabled:
  filter_include: */models/*.blend ;
  filter_exclude: *.blend? ;


To me the exclusion rules should prevent that warning, but i still regularly get it.
I have the suspicion it may relate to new folders being present and those then being part of both pairs?

[Zenju]

; is not the correct separator, | is: https://freefilesync.org/manual.php?topic=exclude-files

[The5]

Oh sorry this didn't actually follow any specific syntax,I wasn't aware there is a | syntax even.
I just tried to give a impression of what the settings in my GUI look like and chose ; to separate it.
Here is the actual settings:

A:
Include:

*


Exclude:

*.blend?
*/F_Models/*.blend
*/F_Textures/*


B:
Include:

*/F_Models/*.blend
*/F_Textures/*


Exclude:

*.blend?


[Zenju]

What does the (full) warning message say?

[The5]

12:42:10     Info:     1.136.043 items found | Time elapsed: 00:04:54
12:42:14     Warning:     Some files will be synchronized as part of multiple folder pairs.
To avoid conflicts, set up exclude filters so that each updated file is included by only one folder pair.
\\192.168.178.223\F_Backup\MIRROR\Assets 💾 F_Models\Game Dev Models\Sniper Game
\\192.168.178.223\F_Backup\MIRROR\Assets 💾 F_Models\Game Dev Models\Sniper Game
💾: Write access 👓: Read access


and "Sniper Game" folder was a new folder created that day.

[Zenju]

I'm assuming that "*.blend" files were present in the newly created folder "F_Models\Game Dev Models\Sniper Game"?

This would have the folder implicitly participate in the second folder pair, although excluded, because copying child *.blend files requires that all parent folders are created first.

This means the folder is created by both folder pairs, thous the race condition.

[The5]

Yes indeed.
So is there an error in my setup regarding having only a subset of files in a folder versioned while the rest is just mirrored without versioning?
Or is this just how it is? (I have to read up if I can automatically ignore this warning or my batch sync job then.)