display – How to find what app is preventing screensaver from starting (Sonoma)?

macOS Sonoma 14.5 — M3 Max MacBook Pro.

Since a couple of days I have been noticing that the screensaver was not kicking in at the specified interval (2 minutes).
How can I find what app is causing this? I diplomatically assume it is not an Apple app, and currently I have Timemator, Sibelius, InDesign, Illustrator, Acrobat DC running as 3rd-party apps.
Is there a way short than shutting down each app and waiting for the screensaver to start?

Here is the result of the pm -g assertion thing in Terminal:

   Assertion status system-wide:
   BackgroundTask                 0
   ApplePushServiceTask           0
   UserIsActive                   1
   PreventUserIdleDisplaySleep    1
   PreventSystemSleep             0
   ExternalMedia                  0
   PreventUserIdleSystemSleep     1
   NetworkClientActive            0
Listed by owning process:
   pid 312(powerd): [0x00064dd800019f62] 00:47:39 PreventUserIdleSystemSleep named: "Powerd - Prevent sleep while display is on"  
   pid 77745(CEPHtmlEngine): [0x00063f4800059bf6] 02:19:20 NoDisplaySleepAssertion named: "Video Wake Lock"  
   pid 366(WindowServer): [0x000657d70009a4a5] 00:00:00 UserIsActive named: "com.apple.iohideventsystem.queue.tickle serviceID:1003119f0 service:AppleHIDKeyboardEventDriverV2 product:Magic Keyboard with Numeric Keypad eventType:3"  
    Timeout will fire in 300 secs Action=TimeoutActionRelease
   pid 359(bluetoothd): [0x000658ca0001a507] 00:00:57 PreventUserIdleSystemSleep named: "com.apple.BTStack"  
   pid 397(coreaudiod): [0x00064dd8000181a9] 00:47:39 PreventUserIdleSystemSleep named: "com.apple.audio.AVVCAggregateDevice-63958-16807.context.preventuseridlesleep"  
    Created for PID: 63958. 
    Resources: audio-in audio-out BuiltInSpeakerDevice 
   pid 397(coreaudiod): [0x00064dd800019b02] 00:47:39 PreventUserIdleSystemSleep named: "com.apple.audio.BuiltInSpeakerDevice.context.preventuseridlesleep"  
    Created for PID: 77190. 
    Resources: audio-out BuiltInSpeakerDevice 
   pid 63922(sharingd): [0x000657d70001a4a7] 00:05:01 PreventUserIdleSystemSleep named: "Handoff"  
Kernel Assertions: 0x8=BT-HID
   id=1494  level=255 0x8=BT-HID creat=23.07.2024, 07:20 description=com.apple.driver.IOBluetoothHIDDriver owner=AppleHSBluetoothDevice
   id=1495  level=255 0x8=BT-HID creat=23.07.2024, 07:27 description=com.apple.driver.IOBluetoothHIDDriver owner=AppleHSBluetoothDevice  

Sibelius is for sure preventing sleep, but it has never prevented the screensaver from starting. Do you see anything odd in there? Or what else can I do?
Thank you

EDIT: I thought it was Adobe Illustrator but today, Monday morning, freshly boot up Mac after more than 24h off, it happened again, and Illustrator was not running, but Sibelius was. So, no idea what this is and how to understand what may be happening.