Event in custom component don't run (C++Builder - 10.4) - "property and method are not compatibile"

With C+Builder 10.4 I can't use event in my custom components. When I place my components inside a form, I receive the error message in the picture ("property and method ... are not compatible). I use the "legacy compiler" for both projects, components and application (VCL).

Component package has only RTL requires.

The complete example to reproduce the problem is here: https://app.box.com/s/426h1kpxrn4f89ta7bfbs2i6nfwmao8h

The same code works well with other version of C++Builder.

I've installed 10.4 + patch 1+2 in a new PC without old C++Builder.

Many thanks

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