dishwasher wont drain even though solenoid engages

Hello Denman,
I have some problem as other. Water do not drain completely. I already did basic troubleshooting like checking for clog. I would suspect a drain flapper, but I would like to get a seconds opinion from specialist.

Could you let me know if flapper should close all the way or only partially (about 3/4)…

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Thanks
Kamil

I am not 100% sure but it looks like it should close further.
I would remove the solenoid and try the flapper without it.
Also check if it is slipping on the shaft.