Unexpected vertical tool offset following the change of workspace G54 G55 G56

Hi,

I wish to do a job requiring 2 tools in 3 Work Coordinates System (WCS) : G54, G55 and G56.
Tool 1 must work in each WCS before changing to Tool 2.

I use the option "Multiple WCS Offsets / Order by Tool" of the Setup in Fusion 360.

I observe that the tool change induces a vertical offset of tool 2.
This offset is precisely the difference between length compensations of tool 1 and tool 2.
This difference is even doubled after the milling of the G55 to G56.

e.g.
Tool 1 Length Compensation -130,00
Tool 2 Length Compensation -133.50
Compensation difference = 3,50

DRO Work_offsets at the end of the program:
G54 X0.00 Y 0.00 Z0.00
G55 X0.00 Y15.00 Z3.50
G56 X0.00 Y30.00 Z7.00
(The 3 Work_offsets are Y-aligned and spaced 15.00).

I'm using Fusion 360 with Mach3, PostProcess Mach3mill_43262

I tried to solve the problem by making changes in the program and looking for good advice on forums, but still unresolved.

I would be grateful for if you could support me for this problem.

Guillaume