Indeed. I can confirm this crash, caused by dragging the master page icon on the layout window. The app disappears even before releasing mouse button.
Whereas it works failurefree with another document.
@CorinSul, previously I did not get the crash with the layers panel visible when I assigned the master not by dragging. Instead right click on the page icon + choose an entry from the pop-menu which opens another options window.
Hi CorinSul,
Welcome to the Affinity Forum!
The missing image in the right bleed area appears to be caused by a nested master layer width of 213 which probably should be 216 mm. Perhaps when positioning the single page masters to the two-page masters you scaled it unintentionally. Or you adjusted master layer widths in purpose to avoid the overlap at the inner bleed on the spreads – if yes, you alternatively can set the inner bleed to 0 for all spreads in the "Document Setup...".
So it seems when adjusting the width of master Kapitel rechts on the master spreads (e.g. Kapitel ohne linkem Text) the nested master Leere Seite did scale, too, but wasn't positioned properly (still starts at negative x for this page) – whereas the image paper_right inside this master Leere Seite maintained its width of 216 (but is visually clipped by its parent layer).
To fix it you could start moving the nested Leere Seite layer + 3 mm / or adjusting the 213 widths to 216 / or, if you decide to avoid the document's inner bleed, adjust more master layers accordingly.
p.s.: I didn't looked for or test what might cause the crash. – Just one more thought about masters: instead single master pages you also could create spreads (e.g. with the two papers) and assign a specific page only to a certain master, e.g. its even or odd half only:
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