There were some issues with mods that also influence/restrict/change zones in the past - you can also post a modlist here

same problem is happening here

Name: Current modlist
Mods:
- Id: brrainz.harmony
Name: Harmony
- Id: ludeon.rimworld
Name: Core
- Id: ludeon.rimworld.royalty
Name: Royalty
- Id: dracoix.doormat.r11a
Name: Door Mat
- Id: unlimitedhugs.hugslib
Name: HugsLib
- Id: fluffy.modmanager
Name: Mod Manager
- Id: dylan.csl
Name: Children, school and learning
- Id: neceros.betterzzzt
Name: Better Zzzt
- Id: notfood.frameratecontrol
Name: FrameRateControl
- Id: rim.job.world
Name: RimJobWorld
- Id: fluffy.blueprints
Name: Blueprints
- Id: neceros.balancedeclipseandsolarflare
Name: Balanced Eclipse and Solar Flare
- Id: vanillaexpanded.vfespacer
Name: Vanilla Furniture Expanded - Spacer Module
- Id: user19990313.runtimegc
Name: RuntimeGC
- Id: vanillaexpanded.vfesecurity
Name: Vanilla Furniture Expanded - Security
- Id: vanillaexpanded.vfeproduction
Name: Vanilla Furniture Expanded - Production
- Id: vanillaexpanded.vfepower
Name: Vanilla Furniture Expanded - Power
- Id: vanillaexpanded.vfemedical
Name: Vanilla Furniture Expanded - Medical Module
- Id: vanillaexpanded.vfecore
Name: Vanilla Furniture Expanded
- Id: avilmask.commonsense
Name: Common Sense
- Id: oblitus.mylittleplanet
Name: My Little Planet
- Id: torann.caravanoptions
Name: CaravanOptions
- Id: syrchalis.prosthetictable
Name: '[SYR] Prosthetic Table'
- Id: haplo.miscellaneous.robots
Name: Misc. Robots
- Id: xeonovadan.propershotguns
Name: '[XND] Proper Shotguns'
- Id: alaestor.miscrobots.plusplus
Name: Misc. Robots++
- Id: voult.betterpawncontrol
Name: Better Pawn Control
- Id: crashm.colorcodedmoodbar.11
Name: CM Color Coded Mood Bar [1.1]
- Id: edb.preparecarefully
Name: EdB Prepare Carefully
- Id: notfood.morethancapable
Name: More Than Capable
- Id: lwm.deepstorage
Name: LWM's Deep Storage
- Id: xeonovadan.visiblepants
Name: '[XND] Visible Pants'
- Id: pinochemicali.skilledstonecutting
Name: Skilled Stonecutting
- Id: timerider.realisticprostheticsexpansion
Name: Realistic Prosthetics Expansion
- Id: ykara.epoe
Name: Expanded Prosthetics and Organ Engineering
- Id: shotgunfrenzy.prioritytreatment
Name: '[SF] Priority treatment 1.1'
- Id: crlsniper.realisticrooms
Name: Realistic Rooms
- Id: frozensnowfox.filthvanisheswithrainandtime
Name: '[FSF] Filth Vanishes With Rain And Time'
- Id: gguake.ai.dsfi
Name: Do Something for Idle
- Id: wofl.morefurnitureupdated
Name: More Furniture [1.1]
- Id: crlsniper.justalittledirt
Name: Just a Little Dirt
- Id: uuugggg.sharetheload
Name: Share The Load
- Id: twistedpacifist.reasonablecomponents
Name: Reasonable Components
- Id: dubwise.dubsmintminimap
Name: Dubs Mint Minimap
- Id: alias.degeneralizework
Name: De-generalize Work
- Id: bdew.fullgunsellprice
Name: Full Gun Sell Price
- Id: ratys.madskills
Name: Mad Skills
- Id: mlie.toolmetricsredux
Name: Toolmetrics Redux (Continued)
- Id: brrainz.achtung
Name: Achtung!
- Id: mehni.pickupandhaul
Name: Pick Up And Haul
- Id: razor2.3.anotherrimworldmod.autocutblight
Name: Auto-Cut Blight
- Id: tradingspot.kv.rw
Name: '[KV] Trading Spot - 1.1'
- Id: smashphil.dropspot
Name: Trade Ships Drop Spot
- Id: 4loris4.morelinkables
Name: More Linkables
- Id: roolo.runandgun
Name: RunAndGun
- Id: notfood.mendandrecycle
Name: MendAndRecycle
- Id: uuugggg.tdbug
Name: TDBug

Originally posted by MasterHation:

same problem is happening here

Name: Current modlist..

I at least don't see anything obvious - can you turn on both logs in the mod-options and enable the Rimworld developer console (in the normal game options) and see if anything comes up the moment the scool-time ends

figured it out for me, "Common Sense" was the issue.

i use that mod too

good to know! I will see what is going on there