On a real 2630 the 4MB is autoconfigured in the 8mb Z2 space, but it supports additional memory via a connected board and this isn't autoconfigured. I don't know if the ROM is supposed to deal with this or not.
I assume WinUAE is using the slider for this extra memory rather than the 4MB autoconfigured memory. It looks like you have to add the auto configured memory manually like you did.
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