MacBook Pro 16" 2019 doesn't enter standby mode

After updating to macOS Sonoma my MacBook Pro 16" 2019 doesn't enter standby mode even at night after more than 10 hours of being closed. pmset -g assertions shows the following:

2023-10-01 09:28:52 +0300 
Assertion status system-wide:
   BackgroundTask                 0
   ApplePushServiceTask           0
   UserIsActive                   1
   PreventUserIdleDisplaySleep    0
   PreventSystemSleep             0
   ExternalMedia                  0
   PreventUserIdleSystemSleep     0
   NetworkClientActive            0
Listed by owning process:
   pid 171(WindowServer): [0x000006ec000988b8] 00:00:00 UserIsActive named: "com.apple.iohideventsystem.queue.tickle serviceID:100001e59 service:AppleHIDKeyboardEventDriverV2 product:Apple Internal Keyboard / Trackpad eventType:3"  
	Timeout will fire in 120 secs Action=TimeoutActionRelease
No kernel assertions.
Idle sleep preventers: IODisplayWrangler

Google says, that there is nothing abnormal. I've set the following settings in pmset long time ago, and before update everything was fine:

System-wide power settings:
Currently in use:
 lidwake              0
 lowpowermode         1
 standbydelayhigh     18000
 proximitywake        0
 standby              1
 standbydelaylow      3600
 ttyskeepawake        0
 hibernatemode        3
 powernap             0
 gpuswitch            2
 hibernatefile        /var/vm/sleepimage
 highstandbythreshold 35
 displaysleep         2
 womp                 0
 networkoversleep     0
 sleep                2
 halfdim              1
 tcpkeepalive         0
 acwake               0
 disksleep            7

One can see standbydelayhigh to be equal to 5 hours, hence, the laptop is expected to enter standby mode after 5 hours of sleeping, but it doesn't: The picture shows a battery statistic for a whole period of time. Before update this statistic had a gap, because it was not collected during standby. One more evidence is that there is a catastrophic battery drain of 5 or 6 percents, i.e. the laptop consumes power while being closed. Before update the battery percentage decreases by the same 5 or 6 percents during a several days (compare with one night after update). Furthermore, before update I have to press a power button after opening a lid, because the laptop was in standby mode. Now the screen needs a very few time to show lockscreen without pressing the power button. Hence, the laptop doesn't enter standby. I looked at activity monitor, nothing prevents sleep there. pmset shows the same, i.e. nothing prevents sleep. I've tried to reset SMC and PRAM, but it didn't help. Bluetooth, Wi-Fi and Airdrop were disabled, when I closed the lid. I can't figure out, what else I can do to resolve the problem.