mod list:

AI-Improvements-1.15.2-0.3.0.jar
angelring-1.15.2-1.2.0.jar
AppleSkin-mc1.15.2-forge-1.0.14.jar
appliedenergistics2-7.0.0-beta.1.jar
astralsorcery-1.15.2-1.12.3.jar
BetterMineshaftsForge-1.15.2-1.3.jar
Bookshelf-1.15.2-5.6.40.jar
Botania-r1.15-388.jar
Bountiful+Baubles-1.15.2-0.0.1.jar
buildinggadgets-3.3.5.jar
ChickenChunks-1.15.2-2.5.0.77-universal.jar
Clumps-5.0.2.4.jar
CodeChickenLib-1.15.2-3.3.1.379-universal.jar
cofh_core-1.15.2-0.4.0b.jar
comforts-FORGE-1.15.2-2.0.0.3.jar
config-2-3.0.jar
CraftingTweaks_1.15.2-11.0.1.jar
CraftTweaker-1.15.2-6.0.0.24.jar
Cucumber-1.15.2-3.0.9.jar
curios-FORGE-1.15.2-2.0.2.6.jar
DarkUtilities-1.15.2-3.1.8.jar
deathquotes-1.15.1-1.0.jar
elevatorid-1.15.2-1.7.1.jar
EnchantmentDescriptions-1.15.2-2.0.9.jar
EnderStorage-1.15.2-2.5.0.149-universal.jar
endertanks-1.15-1.8.1.jar
ensorcellation-1.15.2-0.4.1b.jar
FastFurnace-1.15.1-3.0.0.jar
FastLeafDecay-v22.jar
FastWorkbench-1.15.2-3.1.1.jar
Hwyla-forge-1.10.8-B72_1.15.2.jar
Industrial+Agriculture[Botania]-1.15.2-1.7.0.jar
Industrial+Agriculture[Core]-1.15.2-1.7.0.jar
Industrial+Agriculture[Industrial+Foregoing]-1.15.2-1.6.1.jar
Industrial+Agriculture[Mekanism]-1.15.2-1.6.1.jar
industrial-foregoing-1.15.2-2.3.3-e356e61.jar
infernalmobs-1.15.2.1.jar
InventoryHud_1.15.2.forge-3.0.1.jar
inventorysorter-1.15.2-17.0.0.jar
invtweaks-1.15.2-2.0.8.jar
ironchest-1.15.2-10.0.3.jar
jei-1.15.2-6.0.2.12.jar
JEIEnchantmentInfo-1.16.1-1.1.0.jar
jeiintegration_1.15.2-3.1.0.1.jar
JustEnoughResources-1.15.2-0.10.1.77.jar
libnonymous-1.15.2-1.1.1.5.jar
light-overlay-4.7.0.jar
lycanitesmobs-1.15.2-2.2.3.2.jar
Mekanism-1.15.2-9.10.9.422.jar
MekanismAdditions-1.15.2-9.10.9.422.jar
MekanismGenerators-1.15.2-9.10.9.422.jar
MekanismTools-1.15.2-9.10.9.422.jar
mining_dimension-1.15.2-1.0.4.jar
Morpheus-1.15.2-4.2.50.jar
MysticalAgriculture-1.15.2-3.0.9.jar
NaturesAura-28.4.jar
Neat+1.6-22.jar
observerlib-1.15.2-1.2.0.v60.jar
Patchouli-1.15.2-1.2-35.jar
Placebo-1.15.2-3.1.0.jar
preview_OptiFine_1.15.2_HD_U_G1_pre30.jar
ScalingHealth-1.15.2-3.0.9+54.jar
shetiphiancore-1.15-3.7.2.jar
SilentLib-1.15.2-4.6.6+59.jar
simplybackpacks-1.15.2-1.4.6.jar
StorageDrawers-1.15.2-7.0.2.jar
swingthroughgrass-1.15.2-1.4.0.jar
switchbow-1.6.jar
TerraForged-1.15.2-0.1.2.jar
themidnight-0.5.9.jar
tinyprogressions-1.15.2-4.0.8.jar
titanium-1.15.2-2.4.2.jar
tombstone-4.5.6.jar
valhelsia_structures-15.0.3a.jar
WailaHarvestability-mc1.15.2-1.1.12.jar
WAWLA-1.15.2-3.0.4.jar
Waystones_1.15.2-6.0.2.jar
Xaeros_Minimap_20.18.0.1_Forge_1.15.2.jar
xptome-1.15.2-v1.1.6.jar

I have a standard tree farm and farm with mystical agriculture crops. I have placed a chunkloader on my base, included farms in chunkloading radius and left for the night. The next evening, when I returned, I found out that all was working fine through the night, except farms. Plants just stopped growing.

Having the same issue. tested with just Chicken Chunks loaded and had the same issue.

We are going to need more information on how you are reproducing this.
Are you in a modded dimension?
Are you on a multiplayer server?
Have you modified your config file?
Feel free to jump on the discord and chat about it: http://discord.gg/9nr3qyC

I was able to replicate on 1.15.2 & 1.16.1

Can someone try with forceload instead of a ChunkLoader?

1.15.2 Made no Difference

Appears to be a vanilla mechanic, only chunks loaded by players will have 'chunk ticks' fired.
Reference: ServerChunkProvider.tickChunks() ln 356, ChunkManager.isOutsideSpawningRaduis(terrible name, should be isPlayerLoading)

Can't speak for the OP.
On my end reproduction was simply to create a new profile on twitch, minecraft version 1.15.2, forge version 31.2.9, install Chicken Chunks. Create a new flat world, plants seed and water in a chunk, throw down a chunk loader and tp ~10,000 blocks away and wait. regardless of wait time the seeds wouldn't grow. Also tested increasing random tick speed which also had no effect.

Can you check if something like a command block, or an AE system keeps working in those chunks?

I've tested a command block with a 'say' command connected to a repeater clock. Works as intended.

Whilst crops aren't growing?

Yup.

Alright, sounds like the chunks are being forced, but random ticks aren't being fired. Fun..

"Fun" Like a logic error in someone elses code. lol

Just tested on a second system. problem persisted.

I think this might be more then just Crops. I got a 1.15 world as well and found that my Ranged Pump is not pumping Lava from the Nether to the Overworld (via ender tanks). I got a chunk loader at the base as well as the pump. I have to keep popping into the nether to get the pump to dump into the ender tank. then return to the overworld to feed it into a "storage" tank so my generator has fuel.

I am new to github, was in search of some prlobem solving. I am trying to build my own pack on 1.15.2. and discovered that my chunk loader does not work in the Nether as @Kadwen01 said it above. First I tought its the ender tank or the ranged pump, but its def the chunk loader not loading if i am not in the nether. i def did not change any configs on any mods.

This has all ready been tested on 31.2.36 and confirmed and tagged by covers as a legit bug hence requiring no more testing on this particular issue currently.

Just a heads up, the mod "Chonk" has random ticks working in 1.16.x in case looking at that source ( https://github.com/Memebeams/Chonk ) gives you some insight. I know Lat looked at it and made some changes to FTB chunk loader, but random ticks still don't seem to fire with his right now.

Yeah no, I'm not doing what they do, https://github.com/Memebeams/Chonk/blob/master/src/main/java/com/memebeams/chonk/chunkloading/ChunkManager.java#L96
Ill submit a proper PR to Forge and have things work properly out of the box.

Hi @covers1624, any chance that we can get a new release soon now that this has been fixed? Thanks and appreciate your work on this mod!