Error when trigger expression item key contain another trigger expression string

It is not possible to save the following trigger expression:

{my replace template:agent.ping.last(0)}

=0 | {my replace template:log["

{my replace template:agent.ping.last(0)}

"].last(0)}=0

Error:

Incorrect trigger expression format "

{constant}={constant}

| {my replace template:log["

{constant}"].last({constant}

)}=

{constant}

" Check expression part starting from "

{my replace template:agent.ping.last(0)}

=0 | {my replace template:log["

{my replace template:agent.ping.last(0)}

"].last(0)}=0 " [CTrigger.update -> CTrigger.checkInput]