Yeah, I've just tested it on 1345 and ObjectCreate() returns false with the 4206 error (ERR_NO_SPECIFIED_SUBWINDOW) even though the subwindow is returned by the WindowFind() function.
It is because of this:
https://www.mql5.com/en/forum/377045/24462687#comment_24462687
https://www.mql5.com/en/forum/377045/24462687#comment_24462687

MT4 build 1344 breaks windowfind()
- 2021.09.06
- www.mql5.com
windowfind works in mt4 build 1340, then in 1344, it gives always a +1 to its normal value, so now windowfin(name) must be windowfind(name)-1 to ge...
Mohammad Hossein Sadeghi #:
It is because of this:
https://www.mql5.com/en/forum/377045/24462687#comment_24462687
It is because of this:
https://www.mql5.com/en/forum/377045/24462687#comment_24462687
So what I do and where I can fix it explain clearly

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The indicator still works with older builds. No info is in the indicator window.