When upgrading from Zabbix 4.0 to 6.0, regular expressions in trigger evaluation are wrong.

{TEST Template:log["/test/test.log"].iregexp("C:\\Windows\\SystemApps\\Microsoft\.Windows\.test")}=0

find(/TEST　Template/log["/test/test.log"],,"iregexp","C:\\Windows\\SystemApps\\MicrosoftWindowstest")=0

Updating from 4.0 to 5.0 is no problem.
Also, when xml exported in 4.0 is imported into 6.0, this phenomenon does not occur and is correct.