Using of renderPlain is deprecated since 10.3.0 and needs to be replaced with renderInIsolation.
Line 21 of mailsystem_test.module

Issue fork mailsystem-3462548

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Extatic created an issue. See original summary.

Extatic opened merge request !15

berdir’s picture

berdir
Primary language German
Location Switzerland
commented
Status: Active » Postponed

This is a Drupal 12 deprecation, there is no need for the helper, we'll eventually require 10.3 and can then just update.