Phal. Cornu-cervi red crown rot?

[troydingle]

Today I sadly found out that the two top leaves of my phal cornu cervi have been dried off. And I wonder if the crown could be rot or something else. The whole plant looks actually fine. The other leaves are okay the roots are okay. No sign of anything rot. The flowers buds are also fully opened. So I don’t know what I could do wrong. And should I just be patient for the plant to get back on track or just get ready to find a replacement? Need some opinions please