When you use the /tick rate command, then save and exit your world, relogging will result in the tickspeed being reset to normal.
To replicate:
Create a new singleplayer world with commands on
Run the command /tick rate [number that is not 20]
Save and quit to title, then play the same world.
If the number from earlier was close to 20, you may need the command /tick query to see that the tickspeed has been reset.
Linked issues
Comments 2
Thank you for your report!
We're tracking this issue in MC-266074, so this ticket is being resolved and linked as a duplicate.
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This duplicates MC-266074 🙂