Walnut tree disease?

My walnut tree of around 5 meter height has this hollow twigs with a web like thing as can be seen on the pictures. Anyone knows it?
Online, with Google lens, I found fungal disease Xylosandrus compactus but no idea if that's it...

Thanks!!!

Well, that doesn't look good. Do you see anything else unusual, e.g., black twigs, dying limbs, or damage, odd growths, discolored or weeping areas on the trunk or the root crown? If so, Pictures may be helpful.

Thanks for your reply! Here some pictures. There's a moldy appearance at the trunk and some other signs as you can see...

Hi, Jasper. It does look like a fungal disease to me. The large hole in the tree trunk looks like a canker and, it's hard to tell from the picture, but the area where a limb was removed looks infected as well. The fact that the center of the stems looks diseased is another piece of evidence. Some fungal diseases enter through a wound and some through the soil, but, as you can see, they travel through the center of the tree affecting the flow of nutrients and water. They are very difficult to treat. If it's possible to remove the infected limbs (meaning it wasn't soil-borne), that could be a solution. I don't really have any idea how long it will live untreated or treated - I've had trees with fungal diseases die very quickly, some I see keep going for a while.

That's just my opinion and I am not any sort of tree expert. I've just seen this a good number of times. I would definitely get a second opinion. I don't know where we you located. In the U.S., we have university extension offices that you can take something like this to and get their opinion at no charge. Another option is a certified arborist who may offer their opinion free of charge in hopes of getting some business.