Yes. I noticed that recently. It isn't a vsync issue. It's a resolution issue. It doesn't happen on 2.4, though. I realized that issue in Chrono Cross, when walking from down to up or vice-versa. CC's native resolution is 320x216 (not 240), maybe it's the problem. I took two photos to show:
See the text on WiiStation v2.4:
View attachment 436325
Now on WiiStation v3.2 (lines duplicated in the fonts):
View attachment 436326
Again WiiStation v2.4 (See the circles):
View attachment 436327
Now on WiiStation v3.2 (see the lines duplicated distorting the circles):
View attachment 436328
These lines appear all over the screen when scrolling vertically the game, giving a general shimmering artifact. You can see that those lines are duplicated lines, like if the original 216 lines were upscaled to something like 224 or something.
EDIT: I just submitted the issue here: https://github.com/xjsxjs197/WiiSXRX_2022/issues/223
I hope it gets fixed some day!
Other thing I noticed on my crt is that after psx bios splash screen, a graphical glitch happens on screen just before the first game screen appear. It doesn't happen on v2.4, though. Only in new 3.x versions.
Besides that and microstutters in SOTN, 3.x versions are better in any other aspects and much more compatible. I want to thank @xjsxjs197, @SaulFabre, @Jokippo and other collaborators for this amazing achievement of making ps1 emulation a reality on Wii.
This is something I've noticed before, as it seems the scaling is not an integer scale. At 480p, SotN has very bad horizontal shimmering because of how the image is being stretched. Ideally the image should be 1:1 at 240p and an exact 2x integer scale at 480p.
This of course would mean some content would display in a slimmer aspect ratio, but I would prefer that to bad shimmering artifacts. And correct me if I'm wrong, but I believe the Wii also lets you stretch the XFB horizontally through hardware with minimal artifacts? RetroArch at least has a "set screen width" setting, which you can see at 0:43 here:
Snes9XRX, at least, is able to stretch the snes's 8:7 aspect ratio to 4:3 in 480p with no shimmering.