7950X B650 에서 테스트 하였습니다
SELECT COUNT(DISTINCT `wr_parent`) AS `cnt` FROM g4_write_bmt WHERE ((INSTR(wr_subject, '占쏙옙占쏙옙占�')>0) ) and (wr_num between '-106954' and '-96954')
Illegal mix of collations (utf8mb3_general_ci,IMPLICIT) and (euckr_korean_ci,COERCIBLE) for operation 'locate' : 1267