I had all free extensions installed. After the update (3.6.0), the problem (missing Text Processing nodes) occurred.
As @christian.dietz mentioned, I uninstalled KNIME HCS Tools (Community Contributions - Bioinformatics & NGS) then restarted KNIME and the problem was solved. After that, I reinstalled KNIME HCS Tools and no problem occurred.
So just uninstall and reinstall the HCS tools in KNIME Community Contributions - Bioinformatics & NGS.
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