The Bad Omen effect given by pillagers doesn't display its duration properly

That is the case for Mining Fatigue as well, which is intended. This is just meant to replicate "permanent" effects.

No mining fatique is not a infinite effect he during enter 5 - 8 min

In both cases, the timer shows up as "**:**". Given that Mining Fatigue has been this way for 4/5 years, it's safe to assume that this is Works as Intended. And Bad Omen being very long is just the developers trying to replicate a "permanent" effect.

See also: MC-141723

The effect appears to be unlimited but is in fact limited. It only lasts 1:40:00. That's 1 hour 40 minutes in-game.

So I think this bug report incorrectly classifies the bug. There is a bug with the timer not showing not the effect itself.

Happens in 1.14.2-Pre-release 3

Can confirm in 21w06a.

Can confirm in 1.16.5 and 21w08b.

Can confirm in 21w10a. Video attached.

This could rather be a suggestion to display Infinity as something better than **:**

Now fixed with MC-121865.