... but not the customized Welcome Notice.
Did you actually customize (edit) the Welcome Notice text?
The Note says:
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If you have created a customized welcome message for your group, we will also send that...
(Yellow highlighter mine)
The way I read it is that if you simply left the boilerplate Welcome notice in place and active, that would not be sent. I think mostly because the boilerplate content is largely redundant with the You've been added... notice.
Shal
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