Will I get a 1099-B when updating Cost Basis on Mutual Funds, but have not sold them?

Hello,

A few years ago, I consolidated my brokerages accounts at Vanguard, in part by transferring some old mutual fund holdings I had elsewhere.  One of those turned out to be an old one - with non-covered shares (meaning the cost basis was not moved over to the new brokerage).

I have the lot information from old statements, so I was planning on updating the cost basis, but saw a mention of receiving a 1099-B.  I "think" it means I will get that if I sell the shares (which I do not plan to), not just because I'm updating the cost basis.

Was checking to see if anyone knows about this - would I receive a 1099-B just because of an update to cost basis, or is this only triggered if I sell the security?

Thanks a lot!