LP:857050 - ST_WITHIN returns wrong result with MULTIPOINT and POLYGON

SELECT ST_WITHIN( MULTIPOINTFROMTEXT(' MULTIPOINT( 2 9 , 2 9 , 4 9 , 9 1 ) ') , POLYGONFROMTEXT(' POLYGON( ( 2 2 , 2 8 , 8 8 , 8 2 , 2 2 ) , ( 4 4 , 4 6 , 6 6 , 6 4 , 4 4 ) ) '))

returns true in MariaDB and false in PostGIS. Neither of the points of the MULTIPOINT is inside the POLYGON