Rack macro parameters not correctly captured in a reaction with listener “script is initialised”

Hi,
I´m working on a “reaction” that analyses all rack devices in all tracks (see attachments).
Results are written to a file in the css script directory.

The device parameters I´m interested in are:
Name (string), Type (string), Class Name (string), Class Display Name (string), collapsed (boolean), Chains (no. of), has macros (boolean), macros mapped (list of boolean), macros visible (no. of), macro parameternames (list), orig. parameternames (list), macro values (list), macro default values (list), Variations (no. of), Device path (str).

The data file should be created once a live set is loaded, so I take “script is initialised” as listener of the reaction “songs device macros list”.
But when the live set is loaded some data is wrong. Let´s look at the attached example live set (macrotestx.als) with 2 tracks each containing a rack device with macros.
The device in track 0 contains “Analog” and has 7 mapped macros, the device in track 1 is the Ableton instrument preset “Poly Synth Brass” with 8 mapped macros.

After loading the live set the file “songsdevicesmacroslist.txt” is written.
The output shows some surprises (no errors in Ableton log file):
Track 0:
– “has macros” is “False”, what is definitely not the case, because the mapped macros list is correct!
– macro parameter names are not taken over
– current macro parameter values are all zero
– also macro parameter default values are all zero
Track 1:
– “has macros” is “False”, what is definitely not the case, because the mapped macros list is correct!
– current macro parameter values are all zero
+ macro parameter names are correct and also their default values! May be because it´s an Ableton preset??

When I add “song´s selected track has changed” as second listener, load the set again (which leads to the same results as above) and than select a different track “magically” all parameters are correct!
I would like to know, what´s the reason for this behaviour. Why are the parameters not correctly read out at initialisation of the script?

Any hints welcome,
regards Dieter

Zip-file contains :
– macrotestx.als : Live set
– macros set.json: CSS script (controller is a dummy controller with button 2, MIDI Channel 1 Value 2 on/off )
– songsdevicesmacroslist.txt: parameter data