host.update method in 2.0 cannot update host macro

For 2.0 if a {$MACRO} macro exists then it's not possible to update it:

Request:
{"jsonrpc":"2.0","method":"host.update","params":{"hostid":"10126","macros":[{"macro":"{$MACRO}","value":"foo"}]},"id":0,"auth":"e3d94003fb212c82888d6342c8209f2a"}

Response:
"message":"Invalid params.",
"data":"Macro \"{$MACRO}\" already exists on \"it0\".",

But such macro update works well in 1.8.13

Creation of a macro works ok in 2.0.

Reproduced for: Zabbix 2.1.0-27709