[BUG] Form - Ajax Processing is not working

I’m using version 9.7.005 and since now I have a problem with the Ajax processing
In a single record form I have three select fields as cascade selection fields and I used the Ajax processing property for this.

It was running correct but until now if I make a selection in the first field the application is running in an endless loop

I found a solution for this BUG or issue

I set the Ajax processing on “None” for each related field and after a generation i defined the Ajax processing parameter again and now it works like in the past.

I’m not quite sure if it is a BUG but it is a stupid situation if I must check existing and working settings and define it again.

Today I have the same problem again