https://bugs.winehq.org/show_bug.cgi?id=43192
--- Comment #2 from Todd Chester ToddAndMargo@zoho.com --- (In reply to Michael Müller from comment #1)
This behavior is expected. Wine needs to allocate the first megabyte in the address space to run DOS software in the vm8086 mode. If you do not need to use any DOS software, you can deny access to the low memory area and the rest of Wine will still work.
This feature is not limited to Wine Staging, so moving to Wine product.
Q. If this is expected, why did it start occurring in 2.10 and not in 2.9?