How to solve this 'Dump view' randomly flashing bad characters?

[knziha]

HexEditor_0.9.6_x86.zip + npp.7.8.9 x32

encoding=utf8

sample text:
textfile.txt

[knziha]

https://github.com/mackwai/NPPHexEditor

[knziha]

after reviewing the repo above , this is the best I can achieve:

The "flashing bad characters" problem is related to c++/optimization, and code generation/basic runtime checks. Really strange.

Maybe I should replace the trailing첼 with □

[knziha]

Caused by an uninitialized buffer during the custom drawing callback.

NPP_HexEdit/HexEditor/src/HEXDialog.cpp

Line 3209 in e36f71f

 TCHAR		text[129];