Vim 8 in edit mode constrains editing and cursor motion - how to disable?

Hi,
Since I upgraded to Vim 8, I am confronted with a new behavior that I find annoying:

According to how I enter insert mode, I am restricted in terms of what I can edit.
For instance, if I want to remove the last character of a line, I would type:
A <backspace> <Esc>
But now, after I enter edit mode with A, I am only able to append text to the end of the line.

How can I disable this constraining of the editable range in insert mode?

Thanks,
Ivan

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