Using /setblock & /fill with fluids of levels at a non-full-block no longer updates the fluid

Steps to reproduce

1. Use the command "/setblock ~ ~ ~ water[level=x]" (where x is an integer within 1-15)
2. The behaviour is reproduced

Behaviour in 1.21.4

The fluid disappears after a brief moment, as if it got updated when no source blocks are present

Behaviour in 25w05a

The fluid stays persistent in place

Other notes

In 25w02a, a "strict" option was added for /fill, /setblock, etc.; I reckon the behaviour described in this bug report should only happen when this option is used.