Why is some Cyrillic strings cut off when creating a vCard QR code using qrlib.php?

Question

PHP

Making a QR code with a vCard contact. I collect from strings like:
...
$addressStreet = quoted_printable_encode('Malookhtinsky prospect, 15');
$addressTown = quoted_printable_encode('Saint Petersburg');
...
So everything works fine. But it is clear that the code contains a lot of information, there are a lot of points.
I noticed that in any QR code generators, the code with the same set of information is clearly "less".
I tried to encode strings without quoted_printable_encode and everything is readable, and the code has become smaller. But, there was a problem that some lines are cut off. And not at the beginning or end, but somewhere in the middle.
For example, the address from the example above is read from the code approximately as Address: Malookhtinct-Petersburg
I can't figure out what's wrong. It seems that the lines do not fit into some kind of restriction. But I could not find what this limitation is and how to get around it. (Generators do it somehow). I would be grateful for a hint what is the matter, or where to look for the answer.

Answer 1

The problem is with the vCard version. Should be
VERSION:3.0 so that there are fewer problems with utf