Problems with BootRunner on macOS BigSur

I have some problems since i updated my MacPro6,1 to BigSur.

1. Bootrunner does not show the label i have defined for my mac OS
2. HDD image from macOS looks different than HDD image from Windows
3. The automatically volume selection is not working
4. Return button is not shown

Here is my bootrunner config:

<?xml version="1.0" encoding="UTF-8"?> PayloadContent PayloadContent com.twocanoes.bootrunner Forced mcx_preference_settings CustomBackgroundPath /Library/images/Oscar_MacPro_2.png

            <key>AutomaticallySelectVolume</key>
            <string>disk1s5</string>

            <key>MarqueeTextPosition</key>
            <integer>1</integer>

            <key>ScrollMarquee</key>
            <true />

            <key>ShowRestartButton</key>
            <true />

            <key>ShowShutdownButton</key>
            <true />

            <key>ShowPopoverOnStart</key>
            <false />

            <key>ShowPopover</key>
            <false />

            <key>HideReturnButton</key>
            <false />

            <key>Timeout</key>
            <integer>30</integer>

            <key>LimitTimes</key>
            <false />

            <key>AutoSelectTimeout</key>
            <integer>15</integer>

            <key>DiskLabelFontSize</key>
            <integer>13</integer>

            <key>HideStatusBar</key>
            <true />

            <key>SelectNoVolumesOnStart</key>
            <true />

            <key>MarqueeOnScreenTime</key>
            <string>10.0</string>

            <key>MarqueeOffScreenTime</key>
            <string>2.0</string>

            <key>LimitDays</key>
            <array><integer>1</integer><integer>1</integer><integer>1</integer><integer>1</integer><integer>1</integer><integer>1</integer><integer>1</integer></array>

            <key>VolumeDescriptions</key>
            <array>
              <dict>
                <key>UseVM</key>
                  <string>false</string>

                <key>VolumeName</key>
                  <string>disk0s3</string>

                <key>VolumeLabel</key>
                  <string>Windows 10 Prof.</string>

                <key>VolumeType</key>
                  <integer>2</integer>

              </dict>
              <dict>
                <key>UseVM</key>
                  <string>false</string>

                <key>VolumeName</key>
                  <string>disk1s5</string>

                <key>VolumeLabel</key>
                  <string>macOS Big Sur</string>

                <key>VolumeType</key>
                  <integer>1</integer>

              </dict>
            </array>
          </dict>
        </dict>
      </array>
    </dict>
  </dict>
  <key>PayloadEnabled</key>
  <true/>
  <key>PayloadIdentifier</key>
  <string>MCXToProfile.e5eeedad-690b-42fa-99cd-5c425c2936a3.alacarte.customsettings.9ce4e950-926d-493b-8612-0c4c4157b33b</string>
  <key>PayloadType</key>
  <string>com.apple.ManagedClient.preferences</string>
  <key>PayloadUUID</key>
  <string>9ce4e950-926d-493b-8612-0c4c4157b33b</string>
  <key>PayloadVersion</key>
  <integer>1</integer>
</dict>

PayloadDescription Included custom settings: com.twocanoes.bootrunner PayloadDisplayName MCXToProfile: com.twocanoes.bootrunner PayloadIdentifier com.twocanoes.bootrunnertest PayloadOrganization PayloadRemovalDisallowed PayloadScope System PayloadType Configuration PayloadUUID e5eeedad-690b-42fa-99cd-5c425c2936a3 PayloadVersion 1

diskutil list:

/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk0
1: EFI ⁨EFI⁩ 209.7 MB disk0s1
2: Apple_APFS ⁨Container disk1⁩ 500.0 GB disk0s2
3: Microsoft Basic Data ⁨winOS⁩ 500.3 GB disk0s3

/dev/disk1 (synthesized):
#: TYPE NAME SIZE IDENTIFIER
0: APFS Container Scheme - +500.0 GB disk1
Physical Store disk0s2
1: APFS Volume ⁨macOS - Daten⁩ 189.5 GB disk1s1
2: APFS Volume ⁨Preboot⁩ 286.3 MB disk1s2
3: APFS Volume ⁨Recovery⁩ 655.5 MB disk1s3
4: APFS Volume ⁨VM⁩ 2.1 GB disk1s4
5: APFS Volume ⁨macOS⁩ 14.9 GB disk1s5
6: APFS Snapshot ⁨com.apple.os.update-…⁩ 14.9 GB disk1s5s1

/dev/disk2 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme +5.7 TB disk2
1: EFI ⁨EFI⁩ 209.7 MB disk2s1
2: Apple_HFS ⁨Time Machine-Backups⁩ 5.7 TB disk2s2

We will try and replicate the issues using your profile.

tim