I updated Calibre to the latest version 6 and somehow everything works properly now except for one thing:
Code:
<meta name="calibre-html-render-data" content='{"size": "A3", "margins": [0, 0, 0, 0]}'/>
This bit in titlepage_start doesn't seem to reflect because the size of the cover is always 1240x1754 pixels (since I use the first page as the epub's cover). Normally the cover page is rendered in 1754x2479 pixels. It's still the same size even if I change A3 to A4, A5 etc.
The maximum_cover_size in Tweaks is at [2000, 3200].
Also is there a way to remove redundant entries in AO3's metadata, namely when the author adds a relationship and friendship tag in Relationship with the same characters. So A/B, A & B but I'd like to only keep A/B in Relationships. Is it also possible to remove mentions of A and B in the Characters metadata if they're already mentioned in Relationships? If not it's fine.