The thick bars will remain appear even when resizing window and scaled resolution is disabled initially.
Sometimes it just auto disappear for no apparent reason or rarely it does not even appear at all, the issue happen at completely random time.
Also the thick bars will also appear when scaled resolution is enabled but will disappear when resizing the window later.
Subsequent toggling on/off scaled resolution will make the visual glitch disappear (appear as intended)
This is what happen when scaled resolution is turned off initially

This is the result of turning on scaled resolution and subsequent toggle on/off scaled resolution

This log appear when reaching this scene
HW.GPU <Critical> video_core\renderer_opengl\gl_shader_gen.cpp:AppendSource:58: Unhandled texture type 1
HW.GPU <Critical> video_core\renderer_opengl\gl_shader_gen.cpp:AppendSource:58: Unhandled texture type 1
HW.GPU <Critical> video_core\renderer_opengl\gl_shader_gen.cpp:AppendSource:58: Unhandled texture type 1
HW.GPU <Critical> video_core\renderer_opengl\gl_shader_gen.cpp:AppendSource:58: Unhandled texture type 1
HW.GPU <Critical> video_core\renderer_opengl\gl_shader_gen.cpp:AppendSource:58: Unhandled texture type 1
HW.GPU <Critical> video_core\renderer_opengl\gl_shader_gen.cpp:AppendSource:58: Unhandled texture type 1
Tested this on the latest commit as of 3174bfd
This one I can confirm is not a driver issue as others experience this issue as well and my _OpenGL_ version is up-to-date. See #2041
OS: _Windows 10 build 14393.447 (codename Redstone 1)_
GPU: _nVidia GT 610 2GB DDR3 (Asus)_
Driver: _Version 375.95_
OpenGL: _Version 4.5_
Also happens in Pokemon Sun/Moon 
@NicolaiVdS As this appears to be a different scene (and even game..), different appearance and unconfirmed to be the same bug, please open a new issue and explain how to reach those spots in the game. Also test if this also is related to scaled resolution.
If you think this should be the same bug just reference it and once we fix one of them we'll just merge issues.
"This is probably the same"-posts often cause meta-issues or send us down an offtopic-spiral.
It seems this is still happening (regression? @Hexagon12 says it was fixed)
Tested on HEAD-0e8c25f, default settings, just ran 3dsutils and put the needed files in nand
I haven't been able to narrow it down, seems like it may be texture invalidation or a timing issue? it's only ever happened after I'm already running it, in the first battle with the Poochyena, and without Stopping, just load the cxi again
@NWPlayer123 the texture cache rework isn't merged. try it out on canary to see if it works there.
@jroweboy played around with it, couldn't replicate, I guess it's fixed, good to know 👍 I'll be sure to check where stuff was merged next time
dunno if this should be closed, could probably remain open until it's merged into nightly but I doubt there'll be a regression
Fixed by #3281 as reported so closing. Feel free to reopen if it is not the case.
Most helpful comment
@NicolaiVdS As this appears to be a different scene (and even game..), different appearance and unconfirmed to be the same bug, please open a new issue and explain how to reach those spots in the game. Also test if this also is related to scaled resolution.
If you think this should be the same bug just reference it and once we fix one of them we'll just merge issues.
"This is probably the same"-posts often cause meta-issues or send us down an offtopic-spiral.