Error message "This file has been edited in a version of Xcode which is unsupported by the designer"

Hello,
I have a problem with VS 2019, I cannot reopen a storyboard.

Repro:
Creating a new storyboard in Visual Studio 2019 gives me (working in designer):

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="6211" systemVersion="14A298i" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES">
  <dependencies>
    <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6204" />
  </dependencies>
  <scenes />
</document>

But after I compile the same storyboard looks like:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="15702" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES">
    <dependencies>
        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="15704"/>
        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
    </dependencies>
    <scenes/>
</document>

and a error message :

This file has been edited in a version of Xcode which is unsupported by the designer. Documents saved in Xcode 11.3.0 format, or older, are supported.

XCode is version 11.3 build 11C29!

When changing toolsVersion to 13196 it works just fine, until I rebuild and open the storyboard again...

Is this a bug or am I doing something wrong?