LEF definition spacing between vvias on the same net

[pars97]

I am using my own custom technology files that I created.
In this kit, I must have a spacing of 2 micon (yes it's huge) between Via1 and Via2 layers.

(I'll add a .zip with the complete tech that you can run if you put it in flow/platform)

In my LEF describing the cells, I am pushing the information on where are the Via1 by using the OBS definition. Here is a short cut of a file :

  OBS
      LAYER Via1 ;
        POLYGON 6.5 0.6 6.5 2.1 8.0 2.1 8.0 0.6 ;
        POLYGON 19.6 0.6 19.6 2.1 21.1 2.1 21.1 0.6 ;.
[...]
END

In my tech LEF definition, I have the following statements for Via1 and Via2 statements :

LAYER Via1
  TYPE CUT ;
  SPACING 2 ;
  WIDTH   1.5 ;
  SPACING 2 SAMENET LAYER Via2 ;

  ENCLOSURE BELOW 0.00 0.06 ;
  ENCLOSURE ABOVE 0.01 0.06 ;
  PROPERTY LEF58_EOLENCLOSURE "
  	EOLENCLOSURE 0.34 0.06 ;" ; 

  ARRAYSPACING CUTSPACING 0.36 ARRAYCUTS 4 SPACING 0.36 ; # Vn.2b

  ACCURRENTDENSITY AVERAGE 0.28 ;
  DCCURRENTDENSITY AVERAGE 0.18 ;
  ANTENNAMODEL OXIDE1 ;
  ANTENNAAREARATIO 20.0 ;
END Via1

and

LAYER Via2
  TYPE CUT ;
  PITCH 2 ;
  WIDTH   2 ;
  SPACING 2 ;
  SPACING 2 SAMENET LAYER Via1 ;

  ENCLOSURE BELOW 1.5 1.5 ;
  ENCLOSURE ABOVE 1.5 1.5 ;
  PROPERTY LEF58_EOLENCLOSURE "
  	EOLENCLOSURE 1.5 1.5 ;" ; 

  ACCURRENTDENSITY AVERAGE 0.28 ;
  DCCURRENTDENSITY AVERAGE 0.18 ;
  ANTENNAMODEL OXIDE1 ;
  ANTENNAAREARATIO 20.0 ;
END Via2

The SPACING 2 SAMENET LAYER Via1 ; is the statement describing the distance between the two layers. I repeteaded this statement for the Via1 description in the hopes it fizes my problem but it didnt.

Most of the time, the router does it's job to avoid putting Via2 close to Via1, but in some instance, it fails.
For example
This is unnacceptable (X:126.8 Y:299) :

And this is ok :

Overall, I have around 30 mistakes over my circuit, which is not much but still a bit bizzare.

Do you have any insight on how the .LEF are treated and what should I change to assure that they are spaced of 2um at all times?

In this .zip, I've replicated the OpenRoad folder tree and added my design plus my tech files.
flow.zip

Let me know if anything else is required.
Many thanks.

[maliberty]

I've converted this to an issue as it is not a discussion. Please file such directly in the future as it gives us more information.

[pars97]

I've tried to make an issue before this post and somehow github bugged out.

Will do next time.
Thanks