[TASK] Implement backwards compatible base VH class

[NamelessCoder]

Prevents deprecation log flooding without requiring massive API changes.

[liayn]

Seems like this changed killed v:render.uncache

Thu, 04 Sep 2025 09:36:35 +0200 [ALERT] request="d124be27c990a" component="TYPO3.CMS.Frontend.ContentObject.Exception.ProductionExceptionHandler": Oops, an error occurred! Code: 20250904093635450d5026- InvalidTemplateResourceException: Tried resolving a template file for controller action "Default->Default" in format ".html", but none of the paths contained the expected template file (Default/Default.html). No paths configured., in file /var/www/html/web/vendor/typo3fluid/fluid/src/View/TemplatePaths.php:617 - {"exception":"TYPO3Fluid\Fluid\View\Exception\InvalidTemplateResourceException: Tried resolving a template file for controller action "Default->Default" in format ".html", but none of the paths contained the expected template file (Default/Default.html). No paths configured.

At least this happened, when we updated from 7.1.3 to 7.1.4

[NamelessCoder]

Pretty sure this change isn't the one causing a problem with v:render.uncache. Can you try reverting commit 68d84ad to see if that solves the problem?

[liayn]

Right, I clicked the wrong PR, sry. Yes,
68d84ad#diff-38f5ddad84242dbb78f7a031ac97a0ba3df9c4e58476fa3007d5e88bbaf99948L117
is the culprit in our case.