The new recipes that are made in the refinery and chemical plant have not unlocked, although they have been researched. The new chemistry research recipe is ok.

Try the command /c game.player.force.reset_technology_effects()

Where do I have to enter that please

Found the lua console.
Got the following message.
Player Ueltje tried to execute the command "game.player.force.reset_technology_effects ()"
Using Lua console commands disables achievements. Please repeat the command to continue.
Have tried it several times. It doesn't work.
Habe die lua-Konsole gefunden.
Habe folgende Meldung bekommen.
Spieler Ueltje hat versucht, den Befehl "game.player.force.reset_technology_effects()" auszuführen
Die Verwendung con Lua-Konsolenbefehlen deaktiviert Errungenschaften. Bitte wiederhole den Befehl um fortzufahren.
Habe es schon mehrfach versucht. Es funktioniert nicht.

Got it now. Thank you very much

Nice, this problem can occur if a recipe has been added to a technology and it has already been searched.