Have you tested it?
I don't believe it is an issue. Yes in early QA testing it was an issue where my multi-boot machines ended up only with the new install listed in
grub 2.06, but it's not been that way for some time.
On the Lubuntu jammy issue tacker that was listed as the first issue, it was marked as resolved on March 27, and was later dropped from the list of items of concern.
I've had the same results with Ubuntu-MATE jammy as well.
FYI: the date I listed was from the history of the issue tracker (it was quick & easy to get).. The change will be documented in bug reports & I can find the actual date if required, but I don't see it as necessary.. The issue hasn't been reported in QA-testing for some time, see List of results for bug #1955109 (and its duplicates) | Ubuntu QA