[KNIME AP 5.2.3] Missing core nodes on startup

[forum]

Internal ticket ID: AP-21672
Fix version(s): 5.2.6, 5.3.0
Other related topic(s):

Several nodes unavailable and uninstallable

Hi, since recently I face an issue where Knime complains about a missing extension. ERROR LoadWorkflowRunnable Status: Error: Node "Java Edit Variable" not available from extension "KNIME Javasnippet" (provided by "KNIME AG, Zurich, Switzerland"; plugin "org.knime.jsnippets" is installed) ERROR LoadWorkflowRunnable Status: Error: Node "Rule-based Row Filter" not available from extension "KNIME Javasnippet" (provided by "KNIME AG, Zurich, Switzerland"; pl…