PSA: Code that runs during template rendering and modifies container values must be modified for XenForo 2.2.18+ / 2.3.9+

[Kirby]

XenForo 2.2.18 / 2.3.9 intoduce a new security mechanisam for accessing the App container.
If there is code that runs during template rendering and modifies container values, this code must be adapted.

@Chris D
This is IMHO a somewhat breaking change, might be worth to note this in the release announcement.

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