Loop showing posts 'after and including' an ACF datetime field

Regarding my post After 4.1.0 update template has no output about 4.0.2 / 4.1.0 update

This setup here is also broken in 4.1.0 but worked in 4.0.2 is there any change in syntax or is this also a sideeffect of the update?

I use it this way:

<Set yesterday>
  <Date format=timestamp>yesterday</Date>
</Set>

<If check="{Field acf_date_time=tmb_date_start format=timestamp}" more_than value="{Get yesterday}">

Here is a screen how it looks in LL 4.1.2

(all posts with Field acf_date_start has a date older than YESTERDAY are shown)

And here, how it should be, in LL 4.0.2

(all posts with Field acf_date_start has a date older than YESTERDAY are not shown)