I am changing one problem to another
I need a mathematical solution and not a system trickery 
Here’s a solution, do you know who is the author? It must be allowed to put a comma even with longer (and round) numbers.
That is a thousand and decimal definition, the problem is that they cannot be combined with ROUND numbers from 1000 digits.
It is not a maths thing, because the number starts out and finishes as text.
Here is a workaround that should handle all cases:
test right away 
Please be aware that when formatted like this you have a string, and not a number. If the number is important, you will need to save this separately.
So after entering, it is not formatted
Oh, you want it in the textbox, sorry, not paying attention
However, you will probably need to give something else the focus (another textbox) in order to activate the lostfocus
Besteht die Möglichkeit mit Ihnen über Whatsapp kurz telefonieren?
I just tried it, it has the same result. It cuts the “, 00” away after the decimal point.
Was the answer to me?
If yes, at what value?
Start a new thread for this
Wie man im Video (gif) sieht, sind die Nullen aber da. Versuche es mal mit der APK oder mit Companion.