unit: application logging to files not working for php wordpress

even though we setup as in doc: https://unit.nginx.org/news/2023/unit-1.30.0-released/#application-logging

still php error log goes to main unit.log file

"testsite": {
		"stderr": "/tmp/unit_app.log",
		"stdout": "/tmp/unit_app_error.log",
		"user": "unit",
		"type": "php 7.4",
		"targets": {
			"direct": {
				"root": "/sites/site/"
			},

			"index": {
				"root": "/sites/site/",
				"script": "index.php"
			}
		}
	}

thanks

# unitd --version
unit version: 1.30.0
configured as ./configure --prefix=/usr --statedir=/var/lib/unit --control=unix:/var/run/unit/control.sock --pid=/var/run/unit/unit.pid --log=/var/log/unit/unit.log --tmpdir=/var/tmp --user=unit --group=unit --tests --openssl --njs --modulesdir=/usr/lib64/unit/modules --libdir=/usr/lib64 --cc-opt='-O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -march=x86-64-v2 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -fPIC' --ld-opt='-Wl,-z,relro -Wl,-z,now -pie'