Compiling Comic script - unresolved variables

When compiling a script based on the Comic Book template included with Scrivener, the panel number variables are not resolving.

It seems like <$N> resolution is OK (e.g. “Page <$N> is compiled as “Page 1” etc.), but Panel <$SN> is compiled as “Panel <$SN>”. The same script, synced via Dropbox, compiles fine on MacOS.

I’m running the latest versions of Scrivener and iPadOS on a 2018 12.9” iPad Pro.

The iOS version only supports a limited number of auto-number placeholders. The sub-section numbering looks to be one of them.