Advanced Level printing issue - Gaps between horizontal and diagonal lines

Hello, everyone,currently I'm finishing my second DIY 3d printer. It is big volume cube with IDEX. As soon as I started testing of printing I got following issue - some horizontal and half of diagonal lines are printed with gaps (please, see pictures). Gaps appears in any place around the bed and has permanent property.\https://1drv.ms/u/s!Aokl2HIfeVpclkZS...-Rg3r?e=ahCVmshttps://1drv.ms/u/s!Aokl2HIfeVpclkjX...Um510?e=tBrosshttps://1drv.ms/u/s!Aokl2HIfeVpclkl7...eAXmK?e=rxXSMVhttps://1drv.ms/u/s!Aokl2HIfeVpclkcc...UQcHt?e=8Gg5aehttps://1drv.ms/u/s!Aokl2HIfeVpclkXm...ql7gM?e=eKbJxcThings that I have tried to solve that issue:- did manual and Auto bed leveling- did skew tests for XY axis and adjusted skew factor- checked dimensional accuracy of the prints- tried different motors and way to move Y axis, with single or double motors- checked many times such simple things as belts tension etc.Printer information:300x300x400 cube with belt driven separate X and Y axisBigTreeTech SKR 1.4 32-bit board with 2209 driversI'm not using END STOPS for X and Y axis, but TMC bump sensitivity feature - M914.Honestly telling I'm out of ideas what can be the source of this issue. I feel that I'm missing something simple.Any suggestion or advice is highly appreciated. Thanks in advance.