Only lazy load self-members on initial sync

Given we have disabled lazy loading for incr syncs in #3840, we can make self-LL more efficient by only doing it on initial sync.  Also adds a bounds check for if/when we change our mind, so that we don't try to include LL members on sync responses with no timeline.

1 files changed, 1 insertions, 0 deletions

diff --git a/changelog.d/3936.bugfix b/changelog.d/3936.bugfix
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+Fix out-of-bounds error when LLing yourself