Update
This bug was fixed in Patch 1.60.54
Problem
My Sim showers and showers but the hygiene bar never budges.

Cause
The mud bath fix from Patch 1.59.73 seems to have turned Shower/Tub combos into tubs and taking a shower is now not working properly anymore.
Solution
Replace your Shower/Tub combos with a shower or take a bath instead
AHQ Thread
Please click me too on this thread if you’re affected by the issue: [OPEN] Shower interaction not filling Hygiene need on Shower/Tub Combo
Mods that help with the issue
[FIXED] Sims don’t stop showering and the hygiene bar never increases
Update
This bug was fixed in Patch 1.60.54
Problem
My Sim showers and showers but the hygiene bar never budges.
Cause
The mud bath fix from Patch 1.59.73 seems to have turned Shower/Tub combos into tubs and taking a shower is now not working properly anymore.
Solution
Replace your Shower/Tub combos with a shower or take a bath instead
AHQ Thread
Please click me too on this thread if you’re affected by the issue:
Mods that help with the issue
By crin • Fixed Bugs • Tags: Hygiene, Shower