~~~
item replace entity @s inventory.18 with minecraft:tipped_arrow[minecraft:custom_name='{"translate":"item.minecraft.tipped_arrow.effect.slowness","color":"white","italic":false}', minecraft:potion_contents={custom_effects:[{id:"slowness", amplifier:3, duration:80}]}] 32
~~~
The above command help you to get a tipped arrow with slowness IV effect for 80tick. However, the display of the item will say 00:00(should be 00:04). When you adjust the duration to 2000, it will say 00:12(should be 01:40).
But I have tested that the real time works and it's truely give you 4s slowness IV when you're shot. Only the display is wrong.
This is a bug which can't reveal the correct duration of custom tipped arrow.
MC-274844
The display of duration of custom tipped potions arrows is wrong
Resolved
Duplicate
0
Thank you for your report!
We're tracking this issue in MC-98310, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support (Technical Issues) – 📧 Microsoft Support (Account Issues)
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki