To enable the new code path that should fix this issue in VBAI 2019, add the following line in the [Settings] section of the Vision Builder.ini file on both the Windows and (if applicable), on the target side as well:
Use_OPCUA_MultiWrite_API = true
On Windows, the Vision Builder.ini file is located in C:\ProgramData\National Instruments\Vision Builder AI\2019
On the RT system, the Vision Builder.ini file is located in etc\natinst\vbai
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