Currently (DeZog 3.1.0,DZRP2.0.0) loading of a 128k SNA file does not alter the 0x7FFD port at all.
Bit 4 in there e.g. selects the used ROM (0 = 128k Editor, 1 = 48k Basic).

As DZRP 2.0.0 lacks the functionality to change a port a new version is required.

This would help loading a 128k SNA file into a real ZXNext or a CSpect emulator.

In MAME loading of 128k SNA is anyway not supported.
In zsim setting the port is supported (3.1.1), ie. it works.
In zesarux it is already supported as "load" is part of the zx spectrum emulation.

I'm not sure if that bug is so serious that it is worth to do a new release. I would have to update:

• dezog
• cspect dezog plugin dll
• dezogif

Maybe I wait to collect a few issues for DZRP.