RibbonXml does not work version:21.8 after that, but version:18.5 is work

hi,
code:
image.png (45.1 KB)
CustomUI.xml:
image.png (36.5 KB)

use Aspose.Cell Version 21.8 after that, the Generated Excel,CustomUI not work,because .rels file custonUI node Type error,As shown below
image.png (27.3 KB)
use Aspose.Cell Version 18.5 after that, the Generated Excel,CustomUI work
As shown below
image.png (27.1 KB)

Thanks

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