1.6.3 - viewer - raw - incorrect rendering when _original added to RAW file extension

[user0]

XnViewMP 1.6.3 64bit
Windows11 (22H2), display resolution 3840x2160, win scaling 150%

Viewer - camera raw files (.nef, .cr2, etc.)
incorrect rendering when _original added to RAW file extension

to reproduce:
0. get any camera raw file, eg badlands-moon.nef
1. add _original to the extension, eg badlands-moon.nef_original
(it happens automatically when app creates backup, eg after GPS editing)
2. open renamed file in viewer
it will be shown with smaller dimensions and washed colors

[xnview]

sorry but i can't reproduce

[user0]

I have updated OP
"_original" shall be added to the extension, not name

[xnview]

yes, loading check extension for RAW files