Processing icmpping* items isn't recovered after correction of incorrectly entered key

Steps to reproduce this problem:
(1) create simple check with incorrect key: icmpping[a,b,c,d,e,f,g,h]
(2) waiting for change of the status of this item on "Not supported" (error "Too many arguments")
(3) correcting the item key: icmpping[]
(4) the item status remains "Not supported"