Changing the KeyDown EH to a KeyUp EH sovles the problem of having to use spawn, call can be used instead. Focus is still lost though.

Problem with that is that the KeyDown EH fires before the change is applied, i.e. the text is not up-to-date. So you type "rahim" and it will search for "rahi".

Can you add a screenshot of how a ControlsTable looks like? No idea what that is.

I have attached an example mission which replicates the example image from the BIKI (https://community.bistudio.com/wiki/CT_CONTROLS_TABLE).

Yes it can. The following example opens the cmd window:

Can't confirm fix mentioned here. RPT is attached.

// productVersion
["Arma 3","Arma3",201,146950,"Diag",false,"Windows","x64"]

It seems that you are launching the game with mods. Try disabling them and see if the crash still occurs. Be aware that this Feedback Tracker is for non-modded Arma only. Crashes caused by mods should be forwarded to the corresponding mod creator.

If retrocompatibility is a concern then another idea would be to add a new config entry:

class MyEdit: RscEdit
{
    allowedChars[] = {48, 49, 50, 51, 52, 53, 54, 55, 56, 57};
};

I was just looking through the game files and noticed this. I didn't play or test anything but that line just seemed wrong and I assumed it would create an error when the script is called.

Bug is still present and still annoying. Fix would be:

This behaviour is already known:
https://community.bistudio.com/wiki/assignedTeam