Problem:

When the night vision potion charm gives you the effect,
because the duration is to short, the decay visual effect of the night vision is permanently active.
This can be either annoying or sickening.

Possible solutions:

• More duration of night vision.
• More duration of potion effects in general.
• Custom night vision effect without decay.
• Remove/reduce decay from for night vision all together.
• Ignore the issue.

The 3:00 potion charm applies night vision with a length of 18s and re-applies at 10s. The effect never reaches 5s. Again, are you using another mod which messes with the duration at which the flicker shows up?

I made a new instance but I still get the same problem. The duration on 3:00 is 7s, and on 8:00 is 20s, re-applies at 0s. Maybe my version is not the correct? Or Neoforge? Idk.

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https://youtu.be/Ncuojj5OpxA

Night vision already uses an extended timer which is longer than the duration required to prevent flashing in vanilla. Are you using another mod that messes with the rendering effect?

I'm not referring to the effect you get when getting the potion effect,
but the decay flickering effect the potion gives when the potion effect is below ~5 seconds.
This effect is permanent when using the 3:00 night vision potion charm,
and intermittent when using the 8:00 night vision potion charm.