I recently updated to Affinity Photo 1.9.1.979, from the Microsoft Store. I had no problems with the previous version, but this version has a strange problem: Whenever I perform an action such as a Merge Down on an effects layer, committing a Live Projection Layer, exporting a picture as a .jpeg, or similar actions involving rasterization, random pixels (often in thin rectangles) are rendered.
The pixels appear to contain information from the previous history layer. For example, after making a picture darker and merging down the layer, there may appear pixels that are still as dark as the original layer. Or when making an edit involving a projection layer and then removing the layer, there may appear pixels that are transparent.
Attached is an example. The original picture (with a disabled brightness adjustment), then darkened and merged with the brightness adjustment, contains a few pixels that are still the original brightness (which can be seen by the history brush). This happens with many other operations.
This is a critical hinderance to my workflow, slowing me down by having to use trial-and-error and undo-redo until the pictures render properly. Any attention or support appreciated!