Bulbo medusae new leaf spots

[An_DS]

Just returned from holidays and noticed the new growth on my Bulbo medusae isn't doing really well.
On the picture: you can see the spots on both sides. It still has to fold open and continue to grow as well. The leaf still doesn't feel as firm as the mature ones.
I guess this is fungal... Due tot the holidays, air circulation and humidity were lower than normal.
Would I already treat this plant with a fungicide?
Any other advice?
Thanks