In plugins with multiple windows (api version 7.4), window.Asc.plugin.callCommand() does not work

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Document Server version: -
Installation method: desctop
OS:Windows 10
Browser version: Chome104
I ran into such a problem that if I try to call in a plugin with several windows (api version 7.4), then I get an error in the logs that this function (window.Asc.plugin.callCommand()) is not provided for in the frame. What is the reason for this behaviour? You have introduced a very good opportunity to create different windows in one plugin, but why is it possible to work with a document only in one of them (starter, as I understand it)?

Hello @Vetal
Is it possible to provide us with your plugin and exact issue scenario (you can record a video file or make screenshots). I believe we have to take a closer look at it.