Does editing a pre-fix set for bgp in IOS-XR cause a loss of network connectivity

Hi,
I have to edit an existing prefix-set for bpg in ios-xr.  When I went to do it the first time it told me it would wipe the existing information so I aborted the change.
I have since read that you need to redo the whole list and add the new network you want.
For example.
existing
pre-fix set TEST
10.10.10.0/24,
11.11.11.0/24
new
pre-fix set TEST
10.10.10.0/24, 11.11.11.0/24, 12.12.12.0/24
1st) is the above correct?
2nd) when this is done will there be any drops in connectivity?
Thank you.

1) It is correct, when you create the new prefix-set with the same name as the old one, it overwrites the old one. Meaning that, it wont "append" to the old config, it creates a new prefix-set from scratch
2) Depends on where are you referencing the prefix-set. For example, on BGP route-policy, there wont be any drop on BGP connectivity, you might even have to do a soft refresh in and out to refresh the advertised/filtered routes

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