After Effects 26.0.0 incorrectly renders to interlaced files

As of AE version 26.0.0 renders that should be rendered to an interlaced format end up as incorrect.
The duration of the export is correct, though the content is playing at 200% and the rest is filled with a solid black (No transparancy)

This workflow has worked for me for 20+ years. Unless I’ve fundamentally messed something up in my workflow this seems like a pretty severe bug, as the reality is that most of linair television still runs on interlaced.

1. Create new composition at 25 fps (in PAL-cases)
2. Add content
3. Add composition to render queue
4. in Render Settings change Field Render to Upper Field First
5. Change output to Quicktime (422, 4444, animation; all have the same outcome)
6. Render