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Getting an interesting effect with adapted Leica lenses on my A7. When I combine my 135APO, a high shutter speed and first curtain electronic shutter I get about 15-20% of the image, from the top, underexposed.
If I use the mechanical shutter all is well. The strange bit is this only happens with my 135. My 12,21,50 and 75 don't have this behavior. My 90 Summarit is still away so I can test that yet. I only have one lens adaptor so I'm ruling that out.
Weird? Normal? Will it happen with the tele zoom?
First curtain electronic shutter can cause what you described, so it's "normal".
On very high shutter speeds, it may be wise to turn it off.