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#PCSX2 Version: PCSX2 v1.5.0-dev-3113-g56a976e27
#Plugins Used: GSdx 20190430225711 (MSVC 19.00 SSE2/SSE41) 1.1.0 [GSdx32-SSE2]
#Description: Mashed has strange graphic error bug where the White Line appears on Dolby Surround Pro Logic II Logo and Game Logo during title screen when Direct3D 11 enable using Software. However using Manual Gmaefixes doesn't fixing the Problem.

Due to my offline status has been stayed before i've saying to you, Happy New Year! and i've keep this bug reports for this game.
Note: It seems appears with workaround for strange graphic error not appearing by enable Direct3D 11 using Hardware, maybe would gets fixed in the next PCSX2 version.

Can this be retested on latest dev build?

Yes, I see this issue can be retested for latest dev build in Mashed (Whenever this bug it could to be confirmed in Fully Loaded update.) later .