Redstone repeaters aren't saving their pending tick information. As a result, every time you exit and reload a world, every active repeater will be updated instantly instead of the delay it should have been.
This is crucial and can break any device that relies on redstone repeater delays.
Here's another way to think about it: If you send a 1 tick pulse into a repeater set to 4 ticks of delay, when should the repeater turn off? Exactly 4 ticks later! However, if you exit before the repeater turns off, the game assumes that 4 ticks have already passed, even if they didn't, and turns off the repeater instantly.
Every other edition of Minecraft stores this delay as a tile tick. Bedrock edition needs to as well. The code for Pending Ticks is already there.
Here's 2 video examples of this serious bug in action:
https://streamable.com/c3lm6
https://streamable.com/qiiml
In these videos we have a 1 tick pulse being sent into a 4 tick repeater. The line of 1 tick repeaters coming after it can indicate to us how long that repeater has been activated for. If we exit the game before that repeater was turned on, the signal is completely lost. If we exit the game while the repeater is on, the delay could become 1, 2, 3, or 4 ticks, when it should always be 4 no matter what.
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Yep same here. I use mini redstone clocks with repeaters and a lamp and every time I leave my world and open it again, the clock has stopped and the lamp is off. This is very frustrating as I use lots of them as strobe lights for haunted houses and I hate having to fix them every time as they are crucial. Please fix!

I can also confirm this as in several of my worlds, I use redstone repeaters as part of a lighting system for rotating functional redstone lighting in my lighthouses (I actually made a Youtube video on how I have made them, so you have examples to build and test with this bug, which is here: https://youtu.be/FHqc3zkSOIM?t=397 , some of the examples get pretty big) and it is disappointing to log out of my world, and log back on later to find it turned off completely (Edit: or the redstone pulse being completely set to on, lighting up all the redstone lamps simultaneously).
It is kind of disappointing that I have to keep a chest with a Redstone Chest in each of my lighthouses to reset these, so hopefully this can be fixed soon.

(Tested before reported - from 'Technical Bugs List' https://docs.google.com/document/d/1nziKYzCr4pBdCRj2gIMlfr9MVdWHd6HyafdiBHx9F0c/edit)
This issue happens in 1.15.0.53 also.

Hola buen dia chic@s saben por que se borran los mapas se me trabbo me vuelvo a meter y ya no esta ayudaaa¡¡

I believe repeaters don't use pendingTicks.

They used to, and now they don't. That's the bug.

Affects 1.16.100.53

Affects 1.16.201 Hotfix
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Still an issue in 1.17.30.
Steps to reproduce
Load
Flip the lever and wait for the lights.
Flip the lever and wait for the lights again.
Flip the lever then quickly Save & Quit.
Reload the world.
Expected results
The lights light at the same time in step (5) just like they do in steps (2) and (3).
Actual results
The lights in step (5) are out-of-sync. See
[media].

1.19.51 also