Error in 7.2

select now() + cast('71 minutes' as interval) as case1     , cast('71 minutes' as interval) + now() as case2     ,
now()+ cast('5 minutes' as interval) as case3     , cast('5 minutes' as interval) + now() as case4     , now();
 


The above works as expected in 7.1, but in 7.2 case1 and case2 have 
different values.  Appears hours to seconds are ignored if it's 
interval + timestamp rather than timestamp + interval.