It does indeed look like we don't have good documentation for the
details you're interested in. Let's see.
> post-parser size […]
As far as I know something like this doesn't exist as a technical
limitation in MediaWiki. A page's final HTML can be much bigger than 2
MiB.
> Post‐expand include size […] added some more templates and started saving
> while substituting them […]
That's a really nice approach to explain how the "post-expand include
size" works. I like it. However, there are some special cases to
consider, most notably Lua modules.
The limits for classic templates work as you described. Every single
usage of a template (including all nested sub-templates) is
effectively substituted. What's counted in the end is the total size
of the resulting wikitext. In other words: not only is a template's
source code counted. It's counted as often as the template is used.
Lua source code doesn't count. Lua is executed with other limits in
mind (runtime and memory usage). What still counts is the size of the
wikitext snippet that's returned by the Lua module. I might miss
something else, but I guess the reason you get confusing results is
because we can't simulate this process by manually substituting
{{#invoke:…}} calls.
Best
Thiemo
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